When we used the questionnaire responses instead, the number of workers (both cases and noncases) identified as being of races other than white rose to 282.
To assess associations between a history of blood in stool, diarrhea or abdominal pain (and the combination of these) with schistosomiasis infection, logistic regression analysis was carried out by using the questionnaire variables as the response variables and schistosomiasis infection as the explanatory variable.
Six focus group discussions, each comprising ten persons, were also carried out to substantiate the responses acquired using the questionnaire.
The responses were collected using the questionnaire from April to June 2005.
To assess the interaction between cosleeping and alcohol or drug use both the questionnaire responses and the data given in the narrative account of the parents were checked to ensure that the parent who had consumed these substances was the same parent who had coslept with the infant.
Using clinical impact methodology and the questionnaire responses of a separate group of 149 patients, we reduced the total number of items to 29.
Because individual students are part of the seminar groups and some teachers facilitated multiple seminar groups, multilevel regression was used for the analysis of the questionnaire responses.
For the diagnostic model that was generated using questionnaire information, the factors of age, education and occupation level, which may have affected the questionnaire responses, were used as baseline covariates.
Exposure assessment for nonfarm occupational pesticide and house and garden use was derived directly from the questionnaire responses, and a binary variable of ever/never use of any pesticide was created for analysis.
We used Remark software [ 12] to scan the questionnaire responses into a computer database.
The questionnaire responses can be used to generate two summary scores, the physical health (CHQ PhS) and psychosocial health (CHQ PsS) subscales.
