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Table 1 Quality assessment of the articles reviewed

From: Low birth weight as a predictor of adverse health outcomes during adulthood in twins: a systematic review and meta-analysis

Study ID (author, year) Clarity External validity Internal validity Total score
    Bias Confounding  
Alin Akerman 1995 [18] 4 2 5 2 13
Bergvall 2007 [19] 5 2 5 3 15
Cnattingius 2009 [20] 5 2 5 3 15
De Zeeuw 2012 [21] 4 2 5 2 13
Groen-Blokhuis 2011 [22] 3 2 5 2 12
Hestbaek 2003 [23] 4 2 5 2 13
Hultman 2007 [24] 4 2 5 3 14
Gardner 1995 [25] 3 2 5 2 12
Ortqvist 2009 [11] 5 2 5 3 15
Rasanen 2000 [26] 5 2 5 3 15
Suvanand 1997 [27] 3 2 5 3 15
Villamor 2009 [28] 5 2 5 3 15
Williams 1996 [29] 4 2 5 3 14
Yokoyama 2007 [30] 5 2 4 3 14
Median (range) 4 (3-5) 2 (2-2) 5 (4-5) 3 (2-3) 13.5 (12-15)