PubMed · 8680251
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S Rose, G Sharpe. Revised mobility allowance: double disadvantage.. https://doi.org/10.12968/bjon.1996.5.2.90
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Many studies have shown a protective effect of cigarette smoking on Parkinson's disease. However, criticism has been raised concerning confounding by genetic factors. We investigated the associations between Parkinson's disease and smoking, alcohol, coffee, area of living, and education in a co-twin control study. Because twins are matched for genetic and familial environmental factors, this design controls for confounding by these factors. We also examined control subjects unrelated to cases. Exposure information was taken from questionnaires answered in the 1960s and 1970s. Parkinson's disease cases were identified through the Swedish Inpatient Discharge Register (IDR) and the Cause of Death Register. In the unrelated control subject comparison, 476 Parkinson's disease cases and 2,380 control subjects were included. In the co-twin control comparison, 415 same-sex twin pairs were included. There was an inverse association between smoking and Parkinson's disease using unrelated control subjects and co-twin control cases. There was no association between Parkinson's disease and alcohol, coffee, or area of living. High educational level was associated with Parkinson's disease in the unrelated control subject comparison but not in the co-twin control comparison. We confirm the protective effect of smoking on Parkinson's disease and establish that the association is only partially explained by genetic and familial environmental factors.
This paper uses longitudinal survey data from Taiwan to investigate the predictors of elderly mortality. The empirical analysis confirms a relationship between socioeconomic characteristics and mortality, but this relationship weakens considerably when estimates are conditional on the health status at the time of the first wave survey. In terms of predictive power, the models with an activities of daily living index fare better (as opposed to models with self-evaluated health or self-reported illnesses). Having said that there is a payoff to the consideration of self-evaluated health jointly with other 'objective' health indicators. Other findings include a strong association between life satisfaction and survival, which prevails even after controlling for other explanatory variables.
Women with breast cancer are one of the largest groups of cancer survivors. This research examined whether breast cancer has a long-term impact on quality of life (QOL) by comparing 5-year disease-free survivors to age-matched controls and by comparing women who sustained a recurrence to disease-free survivors. Controls were recruited using the neighborhood control methodology. QOL (physical, emotional, social, and spiritual) was assessed during in-person interviews. There were no differences between disease-free survivors (n = 267) and controls (n = 187) on many indicators of QOL. However, survivors reported more difficulties with physical functioning, more physical symptoms, and more faith than did controls (all ps < 0.05). Compared to disease-free survivors, survivors with a recurrence (n = 37) had a worse QOL on most indices, less positive affect, more general fatigue, and more intrusive and avoidant thoughts (all ps < 0.05). There were no differences between the two groups of survivors on indices of marriage, work experiences, or spirituality. These findings suggest that the QOL of long-term survivors who remain disease-free is comparable to that of women their age with the exception of physical functioning. Women who sustain a recurrence suffer an impaired QOL in some, but not all, domains.