A common, standardized questionnaire is administered by trained health workers to both case patients and control subjects. The questionnaire is designed to collect information on sociodemographic factors, health history, reproductive history, use of hormones, early risk factors, body silhouette at various ages, physical activity, diet, occupation, environmental risk factors, ethnicity, quality of life, and family history of cancer.
Anthropometry and silhouette at various ages: Participants are asked to indicate which body silhouettes, from among nine options (from very thin to very fat), most closely match their own at six points in time: before menarche, 2 years after menarche, at the age of 18–20 years, before their first pregnancy, at the age of 25–35 years, and at their current age. The use of these pictograms has been validated in various settings and shown to be reliable. Anthropometric measurements are taken by trained personnel using standardized methods according to the recommendations of Lohman et al. (1998).
Lohman TG, Roche AF, Martorell R, editors (1998). Anthropometric standardization reference manual. Champaign: Human Kinetics Books.