Previous research indicates that recall bias can be minimized with the use of high quality questionnaires administered to participants and proxies who are unaware of the study hypothesis [ 54].
The purpose of this study was to explore factors related to PCC, and investigate the association between PCC and maternal health care through an appropriate research design, a high-quality questionnaire, and fieldwork in Nanhai and Pinghu.
Participants took about 10 minutes to complete a red 4-page high quality printed questionnaire, and received complimentary tokens like a piece of toothpaste and a towel valued at 10yuan RMB.
We believe our prevalence estimates are credible due to the high quality of questionnaires used to measure psychological morbidity and the representativeness of our level three samples.
The resulting PACT-Q is a brief, easy-to-use, high quality patient-completed questionnaire, available in 14 different languages.
No subjects had any difficulty using the instruments, indicating a high quality of the questionnaires.
For all other languages it is advisable to first choose the best available original version of the neck-specific questionnaires and perform a high quality translation of this questionnaire.
[ 5] Of the 389 gynaecologists surveyed, 195 were randomised to receive the questionnaire on high quality paper and 194 were to receive the questionnaire on standard quality paper (figure 1).
The relative rate of response to the questionnaire printed on high quality paper compared to standard quality was therefore 0.75 (95% CI 0.53 1.05, p = 0.1).
Based on the quality criteria proposed by Terwee et al. [ 17] none of the three identified questionnaires had a high quality.
