Objective To examine the fertility and pregnancy wastage rates in a group of presumably
fertile couples. Design Prospective observational study of 200 couples desiring to achieve …

In 1995–1996, the authors mailed a food frequency questionnaire to 3.5 million American
Association of Retired Persons members who were aged 50–69 years and who resided in one …

Cancer incidence trends from the late 1940s to 1983–84 were assessed among white residents
of five geographic areas (Atlanta, Connecticut, Detroit, Iowa, San Francisco-Oakland) by …

This paper explores the roles of different levels of government in assisting the poor. Using a
model incorporating utility interdependence, the paper first presents some theoretical results …

The synthesis of a new retinoid, N-(4-hydroxyphenyl)-all-trans-retinamide, which has useful
biological properties, is described. This retinoid was more potent than retinyl acetate in …

Measures of semen quality are used as surrogate measures of male fertility in clinical andrology,
reproductive toxicology, epidemiology, and risk assessment. However, only limited data …

Objective To test whether changing a food frequency questionnaire (FFQ) on the basis of
cognitive theory and testing results in greater accuracy. Accuracy was examined for 4 design …

Although every food frequency questionnaire (FFQ) requires a nutrient database to produce
nutrient intake estimates, it is often unclear how a particular database has been generated. …

ObjectiveWe evaluated the performance of the food-frequency questionnaire (FFQ)
administered to participants in the US NIH–AARP (National Institutes of Health–American …

The relation between the dietary intake of vitamins E, C, and A (estimated by a 24-hour
recall) and lung cancer incidence was examined in the First National Health and Nutrition …