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Table 2 Quality assessment of epidemiological studies included

From: The prevalence and burden of subthreshold generalized anxiety disorder: a systematic review

Criterion Unbiased random population sample Adequate sample size (>1000) Adequate response rate (>70%) Analysis of non-respondents Reliable and valid assessment of GAD Total quality score (max. 5)
Angst, 2006 [43] 1 1a 0b 1b 1 4
Beesdo, 2009 [44] 1 1 1 1e 1 5
Bienvenu, 1998 [45] 1 1 0 1c 1 4
Carter, 2001 [46] 1 1 1 1 1 5
Grenier, 2011 [47] 1 1 0 0 1 3
Heun, 2000 [48] 0 0 0 1d 1 2
Hoyer, 2002 [49] 1 1 0 0 1 3
Kertz, 2011 [50] 0 0 0 1 1 2
Kessler, 2005 [51] 1 1 1 1f 1 5
Maier, 2000 [52] 1g 1g 1g 0g 1 4
Olfson, 1996 [53] 1 1 0 1 1 4
Potvin, 2011 [54] 1 1 1 1 1 5
Rucci, 2003 [55] 1 0 0 1 1 3
Ruscio, 2007 [56] 1 1 1 1f 1 5
Szadoczky, 2004 [57] 1 1 1 0 1 4
Weiller, 1998 [58] 1 1 0 0 1 3
Wetherell, 2003 [59] 0 0 0 0 1 1
Wittchen, 2002 [60] 1 1 1 1 0 4
  1. athe stratified sample represents 2600 persons; bfrom [61]; cfrom [62]; dfrom [63]; efrom [64]; ffrom [65]; gfrom [66].