The validity and reliability of the questionnaire was evaluated in a preliminary study. To assess its feasibility, face, and content validity, the questionnaire was pretested on 51 Chinese women who had migrated recently from southeastern China to Australia. The subjects in this pilot trial were recruited by quota and snowball strategies. Essentially the same questionnaire was administered in both Australia and China, although feedback from the pretest of the 51 women had led to some minor modifications of the initial questionnaire, which measured their tea consumption and habitual diet back in China. The internal reliability and reproducibility of the questionnaire were then assessed by a test-retest conducted in Hangzhou, confirming that it was an appropriate instrument to measure the required information for adult Chinese women (20) .