Quality of life was measured using three standard questionnaires: the Nottingham Health Profile (NHP), the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ C30) and its lung cancer supplementary questionnaire (QLQ LC13) in addition to a study specific questionnaire collecting data on demographic, social, clinical and performance status.
The population was then further limited to 3,123 women who answered a supplementary questionnaire about analgesic use and who provided a second blood sample in 2000, and to 2691 women who had serum creatinine measured on both blood samples.
The reasons for aspirin use were not assessed for the entire cohort, but a supplementary questionnaire was sent in 1993 to a sample of 211 men who reported aspirin use from 1986 to 1990 (88% response).
In addition, a supplementary questionnaire on immune status was also implemented.
To assess this kind of information a supplementary questionnaire is necessary.
Diabetes cases were defined as self-reported diabetes at baseline confirmed by a validated supplementary questionnaire.
Any woman who was offered a mentor received a supplementary questionnaire about her experience of mentoring.
First, both surveys included a detailed questionnaire, a supplementary questionnaire and a clinical trial.
Type 2 diabetes was ascertained by self-reported cases confirmed using a validated supplementary questionnaire (21).
Self-reported cases of type 2 diabetes were confirmed by supplementary questionnaire.
Parents and guardians answered a supplementary questionnaire on socioeconomic and behavioural variables.
