Table 5

Methodological quality of included quantitative studies (nā€‰=ā€‰8)
Quality category Studies meeting criterion, n (%)
1. Subject Selection
2. Representative of population of interest 1 (12.5)
1. Selected group 1 (12.5)
0. Highly selected or not described 6 (75.0)
2. Comparability of groups analysed on demographic characteristics
2. Comparable (or matched) 1 (12.5)
1. Not comparable but adjusted analysis used 1 (12.5)
0. Not comparable and not adjusted for differences 3 (37.5)
Not applicable: no comparisons made 3 (37.5)
3. Participation rate
2. High participation rate (>80%) and no important differences between participants and non-participants 0
1. Moderate participation rate (65-80%) and no important difference between participants and non-participants 0
0. Low participation rate (<65%), important differences between participants and non- participants or not described 8 (100)

Chambers et al.

Chambers et al. BMC Cancer 2012 12:184   doi:10.1186/1471-2407-12-184

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