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Table 4 Quality assessment of included studies

From: Large-scale, prospective, observational studies in patients with psoriasis and psoriatic arthritis: A systematic and critical review

First author* 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Sum
Treatment-related observational studies
Driessen 2008[66] 1 1 1 0 1 1 0 1 1 1 1 1 1 1 1 0 0 0 13
Fortune 2003[6] 1 1 1 0 1 1 1 1 0 1 1 1 1 1 1 1 1 1 16
Lecha 2005[68] 1 1 1 0 1 0 1 1 1 1 1 1 0 0 0 0 0 0 10
Naldi 2008[69] 1 1 0 1 0 1 1 1 na 1 1 1 0 0 0 0 0 0 9
Paul 2003[70] 1 1 1 0 1 1 1 1 0 1 1 1 1 0 0 0 0 0 11
Wahl 2005[71] 1 1 1 0 0 0 1 1 na 1 1 0 0 0 0 0 0 0 7
Heiberg 2008[72] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 15
Kristensen 2008[74] 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 0 0 0 14
Sparado 1997[78] 1 1 1 0 0 1 1 1 1 1 0 1 0 0 1 1 0 0 11
Saad 2009[79] 1 1 1 1 1 0 1 1 1 1 1 1 1 1 0 0 0 0 13
Non-treatment related observational studies
Carrascosa 2006[82] 1 1 1 1 1 0 1 1 na 1 0 1 0 0 1 1 na na 11
Colombo 2008[11] 1 1 1 0 1 1 1 1 na 1 0 1 0 0 1 1 na na 11
Schmid-ott 2005[83] 0 1 1 1 1 0 1 1 na 1 0 1 0 0 1 1 na na 10
Husted 2007[2] 1 1 1 0 1 1 1 1 na 1 1 1 1 1 1 0 na na 13
Kane 2003[93] 1 1 1 0 1 0 1 1 na 1 1 1 0 0 1 0 na na 10
Lindqvist 2008[95] 1 1 1 0 1 1 1 1 na 1 1 1 1 1 0 0 na na 12
  1. *Primary paper for the study or the most recent analysis of the cohort. NA, not applicable