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Large bowel cancer in women in relation to reproductive and hormonal factors: a case-control study.

A community-based case-control study of the effect of reproductive factors on risk of large bowel cancer in Australia is described. The study involved 155 cases (99 colon cancer, 56 rectal cancer) and 311 controls who were interviewed with regard to pregnancies and their outcomes, lactation, menstrual history, and oral contraceptive (OC) use. Increasing parity was associated with a decreasing risk of colon cancer; para 0, relative risk (RR)=1; para 1-2, RR=0.9, 95% confidence interval (CI)=0.4-1.8; para greater than or equal to 3, RR=0.4, 95% CI=0.2-0.8; later age at first live birth (AFLB) was associated with increasing risk (AFLB less than or equal to 21 yr, RR=1; 22-25 yr, RR=2.3, 95% CI=1.0-5.5; greater than or equal to 26 yr, RR=2.7, 95% CI=1.2-6.2). These effects were independent of each other. Parity appeared to exert its predominant effect on risk of cancer of the right colon. OC use was more common among controls than cases (RR=0.5; 95% CI=0.3-1.2 for ever vs. never users) and showed a dose-response effect in multiple logistic analysis. The pattern of point-estimate RR for rectal cancer was largely congruent with those for colon cancer but was not significantly different from 1.0.

Adult↗

Grand grand multiparity and birth weight.

OBJECTIVE: To evaluate the association between birth weight and birth order in grand grand multiparous women (i.e., those who have had at least ten deliveries). METHODS: The longitudinal population consisted of 96 grand grand multiparous women with 1098 singleton deliveries. Two birth cohorts formed the cross-sectional reference populations: one from 1966 with 7564 deliveries and one from 1985-1986 with 5691 deliveries. In each population, birth weight was compared in four birth-order groups: first, second to fifth, sixth to ninth, and tenth to 12th born. RESULTS: The birth weight increased with birth order in each population, especially in the longitudinal one. The association remained even after adjusting for gestational age, sex of the newborn, maternal diabetes mellitus, and body mass index. Children born tenth to 12th were 83 g (95% confidence interval [CI] 29, 137) heavier than those born sixth to ninth; these in turn were 29 g (95% CI -27, 85) heavier than children born second to fifth, and those born second to fifth were 169 g (95% CI 54, 283) heavier than first born infants. Further indirect adjustment for the secular trend decreased these contrasts somewhat. CONCLUSION: Birth order is an independent determinant of birth weight even until the tenth delivery.

Adult↗

Short pregnancy interval, low birthweight, and the sudden infant death syndrome.

Pregnancy intervals were calculated for 54,369 later-born singletons delivered during 1969 in the State of North Carolina. Subsequent infant deaths among this cohort were categorized into probable sudden infant death syndrome (SIDSp), other postneonatal home deaths, all postneonatal hospital deaths, all neonatal deaths, and all deaths due to congenital malformations. Each death was matched with a control drawn from the population of infants surviving the first year of life. The matching variables were maternal age, race, mother's education and number of previous live births. All categories of death showed higher proportions of short intervals among cases than controls. Comparing the interval distributions by means of the X2 test for linearity produced significant results for only SIDSp and neonatal deaths. It was concluded, however, that short-pregnancy interval probably has a similar effect on the risk of death from all five cause of death groups. The introduction of birthweight as a fifth matching variable left no significant differences in the distributions of pregnancy intervals between cases and controls. This was interpreted as evidence that short pregnancy interval exerts its influence on risk of death in infancy through its effect on birthweight. The estimated reduction in prematurity and infant mortality that might result from the elimination of short pregnancy intervals was 5% and 6%, respectively.

Adult↗

Previous preterm and small-for-gestational-age births and the subsequent risk of stillbirth.

BACKGROUND: Some causes of stillbirth may also lead to fetuses that are small for gestational age (have a low birth weight with respect to their gestational age) or are delivered preterm (before 37 weeks of gestation). It is not known whether the birth of a previous small-for-gestational-age or preterm infant increases the subsequent risk of stillbirth. METHODS: We assessed the associations between previous adverse outcomes of pregnancy and the risk of stillbirth in a nationwide Swedish study of 410,021 women who delivered first and second consecutive singleton infants between 1983 and 1997. There were 1842 and 1062 stillbirths during the first and second pregnancies, respectively. RESULTS: As compared with women whose first infant was born at term (37 weeks of gestation or more) and was not small for gestational age, women whose first infant was born at term or preterm and was small for gestational age had an increased risk of stillbirth during their second pregnancy. The odds ratios for subsequent stillbirth, after adjustment for covariates known to be associated with an increased risk of stillbirth, were 2.1 (95 percent confidence interval, 1.6 to 2.8) among women with a first infant who was born at term and was small for gestational age, 3.4 (95 percent confidence interval, 2.1 to 5.6) among women with a first infant who was moderately (32 to 36 weeks of gestation) preterm and small for gestational age, and 5.0 (95 percent confidence interval, 2.5 to 9.8) among women with a first infant who was very (before 32 weeks of gestation) preterm and was small for gestational age. The odds ratio for subsequent stillbirth among women with a first stillborn infant was 2.5 (95 percent confidence interval, 1.4 to 4.7), as compared with women whose first infant was not stillborn. The rates of stillbirth in second pregnancies ranged from 2.4 per 1000 births among women whose first infant was born at term and was not small for gestational age to 19.0 per 1000 births among women whose first child was very preterm and was small for gestational age. CONCLUSIONS: Delivery of a previous small-for-gestational-age infant is an important predictor of the subsequent risk of stillbirth, particularly if the infant was delivered preterm.

Adult↗

Oral contraception, parity, breast feeding, and severity of rheumatoid arthritis.

OBJECTIVE: To investigate the influence of breast feeding, use of the oral contraceptive pill (OCP), and parity on rheumatoid arthritis (RA). METHODS: One hundred and seventy six women with RA were compared with 145 control subjects; all had at least one child. RA patients were classified as having severe (n = 82) or mild disease (n = 89) according to clinical joint evaluation, radiological score, biological inflammation, and the presence of HLA-DR1 or -DR4 alleles. RESULTS: The mean age of RA patients was 58 years, and the mean age at the time of diagnosis of RA was 46 years. The mean time between onset of RA and the first birth was 23.6 (SD 3.8) years. The OCP user rates were 33% in the RA group and 47.6% in the control group (p < 0.02). OCP use was related to the mother's year of birth. The relative risk for developing RA was 0.598 (95% confidence interval (CI) 0.33 to 1.1) in women who had used OCP for more than five years compared with those who had never used OCPs. In contrast, the age at which the first pregnancy occurred, the number of children breast fed, and the duration of breast feeding were comparable in RA patients and healthy subjects. Among the RA patients, parity, duration of breast feeding, and the number of breast fed children were significantly increased in those with severe disease. Having more than three children increased the risk of developing severe disease 4.8-fold when adjusted for age and OCP use. Forty six percent of women with severe RA had a history of breast feeding duration greater than six months before disease onset, compared with 26% of patients with mild disease (p < 0.008). Having more than three breast fed children increased the risk of poor disease prognosis 3.7-fold. In contrast, OCP use had a protective role in the course of RA (44% of RA patients with mild disease were OCP users, compared with 21.7% of those with severe RA; p < 0.001). Among those using OCP for more than five years, the relative risk of developing severe disease was 0.1 (95% CI 0.01 to 0.6), after adjustment for age, parity, and breast feeding. CONCLUSION: Our results suggest that parity, and to a lesser extent breast feeding, before RA onset worsened RA prognosis, whereas OCP use had a protective role. Prolactin and oestrogen may have a role in these effects.

Adult↗

Breast feeding and lower respiratory tract illness in the first year of life. Group Health Medical Associates.

OBJECTIVE: To assess the relation between breast feeding and subsequent experience of lower respiratory tract illness. DESIGN: Prospective (from well child visits) and retrospective (from maternal recall) study of breast feeding and prospective assessment by paediatricians of lower respiratory tract illness in infants during first year of life. SETTING: Health maintenance organisation. PARTICIPANTS: Over 1000 infants who were healthy at birth and whose parents used the paediatricians of a local health maintenance organisation. MAIN OUTCOME MEASURES: Duration of breast feeding and type of lower respiratory tract illness (wheezing and non-wheezing) at different age intervals during the first year of life. RESULTS: Breast feeding was associated with a decreased incidence of wheezing illnesses only in the first four months of life. Interactions existed between breast feeding and sharing a room, being Mexican American, and being a boy. Multivariate techniques showed that after controlling for a variety of factors children who received minimal breast milk had a greater risk of early wheezing illnesses; the risk was further increased by simultaneous exposure to sharing a room. CONCLUSION: Breast feeding seems to protect against wheezing respiratory tract illnesses in the first four months of life, particularly when other risk factors are present.

Breast Feeding↗

Influenza virus infections in infants.

BACKGROUND: Universal immunization of children with live attenuated cold recombinant vaccine has been proposed. The renewed recommendation for maternal immunization with influenza vaccine should increase the amount of antibody transmitted to the infant and postpone the need for active immunization. This study examines the risk of influenza during the first year of life to provide information about the time to initiate active immunization. METHODS: Infants followed from birth to 1 year of age in the Houston Family Study were monitored weekly for influenza virus infection. Serum specimens were tested for evidence of infection at 4-month intervals. RESULTS: One-third of 209 infants were infected during the first year; most of the infections occurred during the second 6 months of life. Only 26 of 69 infections were detected before 6 months of age compared with 43 afterward. More striking was the concentration of serious illnesses in the latter half of the first year; 8 of 9 otitis media episodes and 9 of 11 lower respiratory tract illnesses occurred in the older infants. CONCLUSIONS: The combination of increased maternal antibody titers that should result from influenza immunization and the lesser risk of influenza in the first 6 months of life allows initiation of active immunization of children after 6 months of age.

Antibodies, Viral↗

Incidence, severity, and timing of subependymal and intraventricular hemorrhages in preterm infants born in a perinatal unit as detected by serial real-time ultrasound.

Real-time ultrasound scans were performed on 66 low-birth-weight infants within the first six hours of life (mean, two hours), and then at 12, 24, 48, and 72 hours, and thereafter at weekly intervals. All of the infants were born in a perinatal unit. The incidence of intraventricular hemorrhage and subependymal hemorrhage was 31%. Eight of 20 infants had small hemorrhages (Papile, grades I and II); seven infants sustained grade III hemorrhages, and five infants sustained grade IV hemorrhages. All hemorrhages occurred in the first 72 hours of life; 25% were diagnosed with the first scan (ie, within the first six hours of life). The infants especially at risk were those less than 29 weeks' gestation. Five infants developed progressive posthemorrhagic ventriculomegaly that subsided spontaneously by age 8 weeks. The mortality in the study group was only 4.5%.

Cerebral Hemorrhage↗

Iron poisoning in young children: association with the birth of a sibling.

BACKGROUND: Iron is a leading cause of death due to poisoning in young children. Because perinatal iron therapy is common, the presence of these tablets, which have a candylike appearence, in the home may pose a hazard to a mother's other young children. We explored the association between iron poisoning in young children and the birth of a sibling. METHODS: We conducted a population-based case-control study linking health care databases in Ontario. Health care records for the mothers of children less than 3 years of age admitted to hospital with iron poisoning between Apr. 1, 1991, and Mar. 31, 2000, were compared with those for the mothers of age- and sex-matched control children without iron poisoning. RESULTS: We studied records for 40 children admitted to hospital for iron poisoning. Seventeen cases (42%) occurred within a year (before or after) a sibling's birth. Children whose mothers had given birth to a sibling were almost twice as likely as children whose mothers had not given birth to a sibling to be admitted for iron poisoning within 6 months of birth (adjusted odds ratio [OR] 1.9, 95% confidence interval [CI] 0.9 to 3.9). The postpartum year was associated with a consistently elevated risk, including an almost 4-fold increase in the risk of iron poisoning during the first postpartum month (adjusted OR 3.6, 95% CI 0.8 to 16.5). INTERPRETATION: Pregnancy is a major risk factor for iron poisoning in young children, and the period immediately after delivery is associated with the greatest risk. Almost half of all hospital admissions for iron poisoning in young children could be prevented by keeping iron supplements safely out of reach in the year before and after the birth of a sibling.

Accidents, Home↗

Breast cancer risk in women who have had children with different partners.

The fetal antigen hypothesis suggests that the lowered risk of breast cancer in parous women may be afforded by the development of antibodies to fetal antigens that are structurally similar to mammary cancer antigens. It has previously been hypothesized that the likelihood of developing such antibodies may be higher among women who have had children with more than 1 partner. Utilizing information on parenthood and breast cancer available in nationwide Swedish registers, we undertook a case-control study nested within a nation-wide cohort to address this issue. Number of partners fathering a child was categorized as 1, 2 and 3 or more. All analyses were restricted to subjects with 2 or more births and encompassed a total of 20,881 women with breast cancer and 111,989 control women. In an unadjusted analysis, the risk of breast cancer was somewhat lower (odds ratio [OR] = 0.94, 95% confidence interval [CI] 0.89-0.99) in women who had had children with 2 different partners compared with women who had had children conceived with the same partner. After adjustment for parity, age at first birth and educational level, however, the risk of breast cancer was slightly elevated (OR = 1.09, 95% CI: 1.03-1.15). Among women who had had children with 3 or more different men, the pattern was similar. The present results provide no support for the hypothesis that greater antigenic exposure afforded by having children with more than 1 man may reduce the risk of breast cancer. It remains possible, however, that pregnancy may influence breast cancer risk through some immunologic mechanism; further testing of the fetal antigen hypothesis may require development of relevant laboratory measures.

Adult↗

Treatment of candidal infections with fluconazole in neonates and infants.

UNLABELLED: To study the therapy, efficacy and safety of fluconazole in candidal mycoses during neonatal phase and infancy a case review in 53 newborns and infants was performed. The majority of these patients were premature with a median birth weight of 1120 g and born within gestational week 23-38. The median age at the onset of fluconazole treatment was 5 weeks. All patients had underlying diseases and several risk factors, which favored the occurence of a systemic candidal mycosis. Systemic candidiasis was the most frequent diagnosis (75.5%). Fluconazole was administered at a daily dosage of 5-6 mg/kg for a median duration of 21 days. The hepatic, renal and hematologic functions were assessed before, one, two, and three weeks after start of treatment. Yeasts were identified in 37 patients. The most common fungus isolated at baseline was Candida albicans (68%). Clinical cure or improvement was reported in 31 out of 38 patients (81.6%). Mycological cure was achieved in 25 out of 32 newborns and infants. Despite the limited number of patients with outcome data, these preliminary results of a small cohort clearly indicate the effective antifungal therapy with fluconazole in neonates and infants. No serious side effects were observed in fluconazole-treated patients. Two patients with megaureter-megacystis-hydronephrosis syndrome and severe meningoencephalitis showed a mild increase in liver enzymes. - CONCLUSION: Fluconazole seems to be an effective therapy for systemic and other forms of candidiasis in infants including very low birth weight infants (VLBWI; <1500 g). These favorable safety and efficacy data are similar to results obtained with fluconazole in older children and adults. These findings, however, must be supported by larger trials. The recommended daily dose is 5 mg/kg body weight. Only in VLBWI the dosage interval within the first two weeks of life should be prolonged up to 3 days and fluconazole serum levels should be monitored.

Antifungal Agents↗

Cerebral ventricular volume assessment by three-dimensional ultrasonography.

We assessed ventricular volume with three-dimensional ultrasonography. The study group consisted of 54 infants admitted to the neonatal intensive care unit (NICU). Gestational age was 32.9+/-3.5 weeks and birth weight was 1774+/-623 g. To obtain images, the transducer was placed on the anterior fontanel. Sagittal sections were serially and automatically scanned from left to right. The angle of scanning was 60 degrees and five seconds were spent on e scanning. Two hundred fifty B-mode images were stored in the built-in computer for later retrieval. We chose the parasagittal sections from the midline to the lateral portion and traced manually an area of the lateral ventricle in each section at intervals of 1 mm. The built-in computer integrated them and measured the ventricular volume. The lateral ventricular size became larger during the first two weeks after birth. The left ventricle was larger than the right one. There was no correlation between lateral ventricular volume and birth weight. Our study shows the normal value of the lateral ventricular volume in neonates.

Cerebral Ventricles↗

Measuring the childbearing motivation of couples referred to the Shiraz Health Center for premarital examinations.

Millions of children who were born during the first decade after the Islamic revolution in Iran are now reaching the age of marriage and childbearing. Short spacing between marriage and the birth of the first child has the potential to cause an excessive and costly increase in the growth of population in Iran. Research into the motivations for the birth of first child among newly married couples can create a knowledge base that will enable health centres to help these couples make better decisions about the timing of their first pregnancy. Using a consecutive sampling technique and administering Miller's Childbearing Questionnaire, data were gathered regarding the childbearing motivations and desires of 300 couples who had been referred to the Shiraz Health Center for premarital counselling. The Childbearing Questionnaire, with some minor modifications, was found to be a valid and reliable instrument for measuring the childbearing motivations of newly married couples of Shiraz County, Fars Province, Iran. The utility of these findings for counselling in health centres is discussed. Based on the results, a longitudinal study is being designed that will allow the development of models for predicting the time of first pregnancy after marriage.

Adult↗

Reasons for first teen pregnancies predict the rate of subsequent teen conceptions.

OBJECTIVE: To identify reasons for inconsistent contraceptive use that antedate conception and continue to predispose participants in adolescent-oriented maternity programs to unsafe sexual practices after delivery. We hypothesized that teens who attributed their failure to use contraceptives before their first conception exclusively to concerns about their side effects and/or their own lack of motivation to prevent conception would report less consistent contraceptive use and more repeat conceptions than would teens who attributed their previous failure to use contraceptives to their lack of capacity to do so. METHOD: We conducted a 2-year, prospective, longitudinal study of contraceptive use and repeat conceptions in a racially/ethnically diverse population of poor 13- to 18-year-olds. The 198 study participants were enrolled consecutively during their first pregnancies from an adolescent-oriented maternity program. RESULTS: The majority (84%) of the teens attributed their failure to use contraceptives before their first pregnancy partially to a lack of capacity to do so. As hypothesized, these teen mothers were significantly more likely to use hormonal contraceptives (85% vs 62%), (particularly Norplant, 47% vs 19%) and less likely to conceive again (13% vs 41%). Most teens attributed their inconsistent contraceptive use during the postpartum study period to three factors: side effects, plans to abstain from sexual intercourse, and their lack of motivation to postpone additional childbearing. CONCLUSIONS: The reasons teen mothers give for not using contraceptives consistently before their first pregnancies predict the occurrence of subsequent conceptions during adolescence. Those who attribute their previous failure to use contraceptives consistently to side-effect concerns and their own lack of motivation to postpone childbearing are least likely to use hormonal contraceptives after delivery and most likely to conceive again. Our findings suggest that future research should focus on the development of more effective interventions for preventing repeat conceptions among adolescent mothers who had the capacity to prevent their first pregnancies.

Adolescent↗

Hormonal and reproductive factors and the risk of bladder cancer in women.

Gender and cigarette smoking are among the most consistent predictors of bladder cancer risk. After adjustment for known risk factors, an excess risk remains for males, suggesting that other factors may be responsible for the gender differences. Given limited data on hormonal or reproductive factors and bladder cancer risk, the authors examined these factors among women in the US Nurses' Health Study cohort. During 26 years of follow-up (1976-2002), 336 incident cases of bladder cancer were diagnosed. Cox proportional hazards models were used to estimate incidence rate ratios and 95% confidence intervals between hormonal and reproductive factors and bladder cancer risk. Postmenopausal women, compared with premenopausal women, were at increased risk (incidence rate ratio = 1.93, 95% confidence interval: 0.99, 3.78). For postmenopausal women, early age at menopause (</=45 years) compared with late age at menopause (>/=50 years) was associated with a statistically significant increased risk of bladder cancer (incidence rate ratio = 1.63, 95% confidence interval: 1.20, 2.23). The association between age at menopause and bladder cancer risk was modified by cigarette smoking status (p for interaction = 0.01). The authors observed no significant associations of age at menarche, parity, age at first birth, and exogenous hormone use with bladder cancer risk. Findings suggest that menopausal status and age at menopause may play a role in modifying bladder cancer risk among women.

Adult↗

Cell proliferation and hormonal changes during postnatal development of the testis in the pig.

Histometrical evaluation of the testis was performed in 36 Piau pigs from birth to 16 mo of age to investigate Sertoli cell, Leydig cell, and germ cell proliferation. In addition, blood samples were taken in seven animals from 1 wk of age to adulthood to measure plasma levels of FSH and testosterone. Sertoli cell proliferation in pigs shows two distinct phases. The first occurs between birth and 1 mo of age, when the number of Sertoli cells per testis increases approximately sixfold. The second occurs between 3 and 4 mo of age, or just before puberty, which occurs between 4 to 5 mo of age, when Sertoli cells almost double their numbers per testis. The periods of Sertoli cell proliferation were concomitant with high FSH plasma levels and prominent elongation in the length of seminiferous cord/tubule per testis. Leydig cell volume increased markedly from birth to 1 mo of age and just before puberty. In general, during the first 5 mo after birth, Leydig cell volume growth showed a similar pattern as that observed for testosterone plasma levels. Also, the proliferation of Leydig cells per testis before puberty showed a pattern similar to that observed for Sertoli cells. However, Leydig cell number per testis increased up to 16 mo of age. Substantial changes in Leydig cell size were also observed after the pubertal period. From birth to 4 mo of age, germ cells proliferated continuously, increasing their number approximately two- to fourfold at each monthly interval. A dramatic increase in germ cells per cross-section of seminiferous tubule was observed from 4 to 5 mo of age; their number per tubule cross-section stabilized after 8 mo. To our knowledge, this is the first longitudinal study reporting the pattern of Sertoli cell, germ cell, and Leydig cell proliferative activity in pigs from birth to adulthood and the first study to correlate these events with plasma levels of FSH and testosterone.

Animals↗

A longitudinal study of bed sharing and sleep problems among Swiss children in the first 10 years of life.

OBJECTIVE: To study age trends, long-term course and secular changes of bed-sharing practices, and sleep problems among Swiss families. METHODS: A total of 493 children were longitudinally followed between 1974 and 2001 by using structured sleep-related interviews at 1, 3, 6, 9, 12, 18, and 24 months after birth and at annual intervals thereafter until 10 years of age. Parents were queried about bed sharing, night wakings, bedtime resistance, and sleep-onset difficulties during the 3 months before each follow-up interview. RESULTS: Although in the first year of life relatively few children slept with their parents (<10%), bed sharing increased with age and reached a maximum at 4 years (> or =1 times per week: 38%). Bed sharing of at least once per week was noted in 44% of the children between 2 and 7 years old. Nocturnal wakings also increased from 6 months old to a maximum at 4 years, when more than half of all children woke up at least once per week (22% every night at 3 years). Less than 10% of all children demonstrated frequent bedtime resistance and sleep-onset difficulties. Bed sharing and night wakings during early infancy were not predictive for bed sharing or night wakings during childhood, whereas both bed sharing and night wakings during childhood tended to persist over time. In contrast, bedtime resistance and sleep-onset difficulties seemed to be rather transient phenomena across all ages. No consistent cohort trends were found except for bedtime resistance, which decreased significantly between 1974 and 2001. CONCLUSIONS: Bed sharing and nocturnal wakings are common during early childhood. Developmental changes in separation-attachment processes, cognitive capabilities to develop self-recognition and nighttime fears, and motor locomotion may contribute to the particular age trend of night wakings and bed sharing during early childhood.

Beds↗

Successful obstetrical management of 110-day intertwin delivery interval without cerclage: counseling and conservative management approach to extreme asynchronous twin birth.

BACKGROUND: This report describes a patient counseling approach and non-surgical management of a dichorionic-diamniotic twin pregnancy where delivery of the second twin followed the delivery of the first by 110 days. CASE PRESENTATION: An early transvaginal sonogram at 19 1/2 weeks suggested cervical dilation with protruding amniotic membranes. Tocolytic and antibiotic therapy was initiated; no cerclage was placed. Spontaneous rupture of membranes and cord prolapse occurred 48 h later, resulting in delivery of a stillborn female infant. Conservative management was offered after counseling for possible risks associated with maternal sepsis, need for extended hospitalization, potential for hysterectomy and death. The cervix appeared closed after delivery and the umbilical cord was ligated, with subsequent spontaneous cord retraction in utero. Reassuring fetal status was observed for twin B without evidence of contractions or chorioamnionitis. A viable male infant (2894 g) was delivered vaginally at 35 1/2 weeks. CONCLUSIONS: This report outlines a counseling approach useful for patients with premature delivery of one twin, and presents application of conservative obstetrical management principles for the aftercoming twin even when delivery interval is extreme.

Journal Article↗