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Table 1 Classification of quality indicators of studies included in the review

From: A systematic review of mental disorder, suicide, and deliberate self harm in lesbian, gay and bisexual people

  Sampling Participation rate Population Sample size
  1 = Non-random 1<60% 1 = Selected 1<100
  2 = Random 2 ≥ 60% 2 = General 2 ≥ 100
Bagley 1997 [9] 2 2 2 1
Bontempo & D'Augelli 2002 [10] Not known 2 1 2
Case et al. 2004 [11]* 1 2 1 2
Cochran & Mays (2000a) & Mays, Ross (2004) [12, 13] 1 2 2 1
Cochran & Mays (2000b) [14] 1 2 2 1
Cochran et al. 2003 & Mays & Cochran (2001) [15, 16] 2 2 2 1
Faulkner et al. (1998) [17] Not known 1 1 2
Fergusson et al 1999 [18]* 1 2 1 1
Gilman et al. 2001 [19] 2 2 2 2
Gruskin et al. 2001 [20] 2 1 2 2
Herrell et al. 1999 [21] Not known 2 1 2
Jorm et al. 2002 [22] 2 1 2 2
King et al. 2003 [1] 1 NA 1 2
Mathy 2002 [23] 1 1 1 2
Mathews et al. 2002 [24] 1 1 1 2
McCabe et al. 2003 [25] 2 1 1 2
Mc Cabe et al. 2004 [26] 2 1 1 1
Nawyn et al. 2000 [27] Not known 1 1 1
Remafedi et al. 1998 [28] Not known 2 1 2
Robin et al. 2002 [29] Not known 2 1 2
Russell & Joyner 2001 [30] Not known Not known 1 2
Sandfort et al. 2001 & Sandfort, de Graf, Bijl (2003) [31, 32] 2 2 2 1
Skegg et al. 2003 [33]* 1 2 1 1
Wichstrom & Hegna 2003 [34]* 1 2 1 2
Drabble et al. 2005 [35] 2 Not known 2 2
  1. Key: * Longitudinal studies; 2 suggests higher quality and than 1