Improvement in cumulative response rates following implementation of a financial incentive

Article Abstract:

The long-term response rate for mail surveys may increase if a financial incentive is included. Since mailed questionnaires fail to generate large cumulative response rates, researchers paid five dollars to participants at the end of a follow-up period in a Canadian breast cancer research project. After more than 20 weeks, cumulative response rates were 20% higher among paid controls than unpaid controls. In addition, fewer efforts were necessary during the follow-up period.

Psychological aspects, Usage, Mail surveys, Survey response rates, Payment, Bonuses

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Bias in the standardized mortality ratio when using general population rates to estimate expected number of deaths

Article Abstract:

Cohort studies are designed to compare the observed number of cases arising in a group under investigation with the number expected to occur based on the general population rates. Although the general population is taken to represent unexposed ones, it is inevitable that it will compromise all types of people, including exposed ones. The study found that bias may be a major problem, causing underestimation of the true relative risk.

Test bias, Scientific surveys

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Complex relation between increasing fat mass and decreasing high density lipoprotein cholesterol levels: evidence from a population-based study of premenopausal women

Article Abstract:

High density lipoprotein (HDL) cholesterol levels can be used to predict the risk of cardiovascular disease in women. Researchers in this study examined this relations with the three domains of body size and type, sex hormone status, and carbohydrate metabolism. Their findings suggest that these domains explained 27% of the total variation in HDL cholesterol levels. Significant variables were insulin levels and smoking.

Cholesterol, HDL, HDL cholesterol lipoproteins

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