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Biomedical subjects

M Koskenvuo

Publications and source records attributed to M Koskenvuo.

At least 235 records · Page 13Linked to original sources

Incidence and prognosis of ischemic heart disease with respect to geographical area. An epidemiological study of middle-aged Finns.

Ischemic heart disease is more common in East Finland than in West Finland, but systematic comparison and follow-up of incidence figures have not been possible. In 1972 the personal identification number became included in the hospital discharge records, which made it possible to link death certificate data with hospital records from the whole country. The results of this study suggest that high mortality from IHD in some regions is more closely associated with high incidence than a high fatality rate. The proportion of deaths outside hospitals showed large variation by province but this had rather little effect on the total one-year survival rates.

Adult↗

Multivariate logit analysis of concordance ratios for quantitative traits in twin studies.

The application of multiway contingency table analysis to the multivariate analysis of concordance ratios in twin studies is developed. The approach is illustrated by data on smoking and alcohol use in Finland and Sweden. This approach can enable the assessment of the effect of other variables on the concordance ratio and thus allow estimates of genetic effects on the trait under study. Hypotheses on relationships between genetic effects and other variables can be tested. After hypothesis testing, model fitting of the best hypothesis can be carried out.

Adult↗

Incidence and prognosis of ischaemic heart disease with respect to marital status and social class. A national record linkage study.

Increased mortality from ischaemic heart disease (IHD) has been found in previous studies among divorced, widowed, and unskilled middle-aged Finnish men. In this study all cases of IHD in men aged 40-64 during 1972 were analysed by linking death certificates and hospital records (7499 cases with 3136 deaths). Age-adjusted incidence, mortality, and survival rates of the first and third year were calculated by marital status and social class. The highest mortality rate was found among unskilled workers, the highest incidence among widowers and those in the lower professional classes, and the lowest survival rate among divorcees, single persons, and unskilled workers. The ratio of mortality by marital status (1.77) was in part due to survival (ratio 1.44) and in part due to incidence (ratio 1.32). The ratio of mortality by social class (1.44) seemed to be due more to differences in incidence (ratio 1.36) than to differences in survival (ratio 1.18). The distribution of conventional risk factors of IHD by marital status and social class seems to explain only part of the mortality differences.

Adult↗

Serum IgE levels in twins.

Serum IgE level was determined in 76 monozygous and 81 dizygous like-sexed twin pairs representing adult twins living in the Helsinki area. Monozygous twin pairs were frequently concordant with respect to elevated IgE levels, although some pairs were strikingly discordant, indicating that there is a wide range of phenotypic expression for each genotype.

Female↗

Diagnosis of twin zygosity by mailed questionnaire.

A deterministic questionnaire method for zygosity determination is developed for use in epidemiological studies of adult twins. It is based on the answers of both members of a twin pair to two questions on similarity and confusion in childhood. The algorithm of the method is used to determine the zygosity status of a twin pair at two different levels of certainty. The validity of the method is tested by making blood marker determinations of 11 polymorphic marker systems fro a random sample of 104 twin pairs. The agreement between questionnaire and blood marker diagnosis was 100%, but the stricter level of certainty left 8.7% in the nonclassified group. The genetical representativeness of the sample is tested by the allele distribution of the markers as compared to the Finnish population data as well as by the distribution of the number of intra-pair differences in blood markers.

Blood Group Antigens↗

Mortality by marital status and social class in Finland during 1969--1971. Mortality from natural and violent causes.

In this paper a study of the distribution of mortality rates by social class and marital status for men and women in three age groups (25--44, 45--64 and 65--84) is presented. Natural and violent causes of death are analysed separately. The death certificates of Finnish citizens for the years 1969, 1970 and 1971 (totalling 137780) were analysed and mortality rates standarized using as reference population the data from the 1970 census. It is shown that certain combinations of social class and marital status can be considered as significant risk factors for mortality in the Finnish population.

Adult↗

Health status of former elite athletes. The Finnish experience.

Physical activity is an important aspect of health behavior and life-style, when considering the possibilities to prevent premature deaths and sustain functional capacity. We studied former Finnish male athletes and controls to investigate the effects of long-lasting participation in vigorous sports on health, and the main findings are reviewed here. The athletes represented Finland between the years 1920-1965 at least once in international competitions. The following sports were selected: track and field athletics, cross-country skiing, soccer, ice hockey, basketball, boxing, wrestling, weight lifting, and shooting. The full name, place and date of birth were traced for 2613 (97.7%) men. The referent subjects (N = 1712) were selected among those Finnish men who, at the age of 20, were classified completely healthy at the medical examination for induction into military service. In most analyses we grouped the sports according to the type of training needed to achieve maximal results, i.e., principally aerobic training, principally anaerobic training or mixed. In 1985, a questionnaire on physical activity, health and health habits was mailed to surviving former athletes and referents (N = 2851, 65.9% of the original cohort). Follow-up for morbidity and mortality was based on national medical registries. We found that former aerobic sports athletes (endurance and mixed sports) in particular have high total and active life expectancy and low risk for ischemic heart disease and diabetes in later years. On the other hand, they have slightly higher risk for lower-limb osteoarthritis. Overall, the benefits of physically active life-style on health were clearly higher than the adverse effects.

Adult↗

Testing of human homologues of murine obesity genes as candidate regions in Finnish obese sib pairs.

The human homologues of recently discovered murine obesity genes provide relevant candidates to study the genetic component of obesity in humans. We analysed the human counterparts to murine obesity genes ob, db, agouti, tub, melanocortin 4-receptor (MC4-R) and mitochondrial uncoupling proteins 2 and 3 (UCP2 and UCP3), as well as two other chromosomal regions reported to be linked to obesity-related phenotypes in restricted populations. We found no significant evidence for linkage to any analysed loci in our total study material of 105 affected sib pairs collected from the genetically homogenous population of Finland. However, several markers on 14 cM chromosomal region flanking the MC4-R gene showed sharing of alleles identical-by-descent (IBD) more frequently than expected. A selected subset of non-diabetic obese sib pairs strengthened the P values down to 0.003 in this particular region. The smallest P value (P = 0.001) was obtained with a marker D18S487 in a subgroup containing only sib pairs with one lean and one obese parent. We therefore screened seven obese subjects included in our sib pair material for sequence changes in their MC4-R gene, but no mutations of apparent causal relationship were found. In conclusion, we could not find evidence for significant contribution of the chromosomal loci corresponding to the murine single gene obesity genes for human morbid obesity, but additional studies are still needed to clarify whether DNA alterations within or adjacent to the MC4-R gene play some role.

Adaptor Proteins, Signal Transducing↗