In the first strata, we place respondents perceptions regarding the lack of availability of clean water and ubiquity of contaminated water leading to diarrhea.
Their overall Inter-Correlation Coefficient (ICC) placing respondents into groups of vigorously active, moderately active or inactive activity ranged from 0.32 to 0.85.
Missing values were reduced to 0.1% by placing respondents younger than 35 years in the category "married less than 10 years", respondents 35-44 years in the category "married 10-20 yeand" and respondents 45 years and up in the category "married more than 20 years".
An existing scale designed for nurses was adapted to a round robin format to place respondents in the position of being 'raters' of items'targetsts.' Construct validity was assessed by two factor analytic methods: factors extracted by exploratory methods were validated on alternate data in CFA frameworks.
It is perhaps not surprising that recruitment and retention were limited given the burden placed on respondents: to attend face to face training and respond to 18 sets of preference measurement with limited rewards (a small cash lottery).
Decreased cognitive burden placed on respondents has been cited as an advantage of BWS; however, the available evidence is not conclusive [46].
However, there were no reports of pressure placed on respondents from managers.
Our findings highlight the importance placed by respondents on interactions between policy makers, researchers and other stakeholders in facilitating the uptake of research findings into policies.
Nevertheless, the use of the measure in clinical settings and large scale population surveys may be limited by its length and the burden placed on respondents.
To address the considerable burden placed on respondents and investigators generically, Ware and colleagues developed a substantially shorter questionnaire, the SF-12, which utilized a reduced number of items from 36 to 12.
