Development and Evaluation of a New Questionnaire on AIDS-Related Knowledge

Lai-Chu See1,2, Yu-Hui Lo1, Tsuei-Mi Huang3, Chia-Ling Chen1,2, Hui-Chun Huang3, Sheue-Rong Lin3

2010 Vol.26 NO.22

Correspondence Author: Chia-Ling Chen


In 2004, there was an AIDS outbreak among Taiwanese injecting drug users (IDUs). A questionnaire on AIDS-related knowledge was thus needed, but the existing questionnaire was outdated. We designed a new questionnaire and evaluated its reliability and validity.
Many psychometric properties were evaluated, including expert validity, construct validity for known group difference, item analysis and internal consistency, and test-retest reliability. Study sample were enrolled from school adolescence, drug users arrested by police, IDUs who received MMT, and public health workers.
The ratings from 9 content experts were all higher than 3.2 (maximum 5), indicating acceptable content validity. During 2005-2007, 3,130 adolescents, 1,162 arrested drug users, 204 IDUs with MMT, and 116 public health workers completed the questionnaire. Public health workers had the highest rate of correct answers, followed by IDUs with MMT, the arrested drug users and school adolescents implying a good known group difference of construct validity. The difficulty index was within the acceptable range, and the discrimination index was >25%. Cronbach’s α was 0.60-0.82, indicating good internal consistency. Regarding test-retest reliability, the correlation coefficient for 83 individuals who completed the questionnaire twice was 0.59, showing good stability over time. Our questionnaire has an acceptable psychometric property, including good expert validity, construct validity and test-retest reliability.