Quality Assessment of Studies using Quantitative Methodology.

Note. Item description: A; question/objective sufficiently described, B; study design evident and appropriate (in addition to corresponding item in QUALSYST [26]: for 2 points (p), study primarily designed to assess prevalence), C; method of subject/comparison group selection described and appropriate, D; subject (and comparison group, if applicable) characteristics sufficiently described, E; response rate >90% = 2 p, 70–90% = 1 p, 100 = 2 p, n>50–100 = 1 p and naFull information regarding scoring of item A, C, D, G, H, I, J, K, L, se corresponding item in QUALSYST [26]. Scoring of item B, E, F, see item description in note under table.bRatio between total score for each study and maximum total score. Ratio 0.75 as high quality.cRatio between sum of item score and maximum item score. Ratio 0.75 as high quality.