A neutral screening question supplemented with questions on headache severity and frequency will probably be the most sensitive method.
These questions were further supplemented by questions on physical function, anxiety and stress taken from other validated instruments.
(A shortened form of the questionnaire sent to non-respondents to the first two mailings did not contain the CAM and dietary supplement questions).
Food intake over the past 5 years was assessed with a modified version of the self-administered 124 food item DHQ created by the National Cancer Institute, which included portion size and dietary supplement questions (Subar et al, 2001).
A set of core questions were kept unchanged and supplemented by questions suggested by recent research.
We will supplement the questions on the Jadad scale with additional questions (yes/no responses) about the adequacy of allocation concealment, use of intention-to-treat analysis, justification of sample size, reporting of outliers and selective outcome reporting.
The questionnaire included standardized questions regarding respiratory symptoms and conditions, and was supplemented with questions about other medical conditions such as heart disease, cancer, and diabetes.
Dietary intake will be determined with questions based on the national guideline for a healthful diet, supplemented with questions about specific dietary habits of the Hindustani Surinamese population [ 34, 38].
The parents of all 8,757 children attending these day-care centres received the International Study of Asthma and Allergies in Childhood (ISAAC) written questionnaire, supplemented with questions on medical treatment, physician assessed asthma diagnosis, and other asthma related questions.
These were supplemented by questions regarding the formation, development, and success of the mini-companies, and by questions concerning the project outcomes.
Smoking questions were based on those used in the UK General Household Survey [ 12] and the International Tobacco Control survey (ITC) [ 17], supplemented by questions on local issues relevant to smoking.
