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Table 2 Assessment of the quality of all studies included in the review

From: Effect of ABO blood group on asymptomatic, uncomplicated and placental Plasmodium falciparum infection: systematic review and meta-analysis

Study no. Author, Year [References] Selection bias Study design Confounders Blinding Data collection methods Withdrawals and drop-outs Final rating
1 Adam et al. 2009 [39] 2 3 3 2 1 NA 3
2 Adam et al. 2007 [24] 2 3 3 2 1 NA 3
3 Adegnika et al. 2011 [25] 2 3 3 2 1 NA 3
4 Alemu and Mama, 2016 [40] 2 3 3 2 1 NA 3
5 AlIi et al. 2010 [41] 2 3 3 2 1 NA 3
6 Alim et al. 2015 [42] 2 3 3 2 1 NA 3
7 Amodu et al. 2012 [43] 2 3 3 2 1 NA 3
8 Bedu-Addo et al. 2014 [44] 2 3 3 2 1 NA 3
9 Boel et al. 2012 [45] 1 1 2 2 1 2 1
10 Carvalho et al. 2010 [15] 1 2 2 2 1 2 1
11 Cavasini et al. 2006 [46] 1 2 2 2 1 2 1
12 Degarege et al. 2012 [16] 2 3 1 1 2 2 1
13 Fowkes et al. 2008 [47] 2 3 3 2 2 NA 3
14 Giha et al. 2000 [48] 2 1 3 2 1 2 2
15 Gupte et al. 2012 [49] 2 2 3 2 2 2 2
16 Igbeneghu et al. 2012 [18] 2 3 3 2 1 NA 3
17 Jeremiah et al. 2012 [19] 2 3 3 2 1 NA 3
18 Joshi et al. 1987 [50] 2 3 3 2 1 NA 3
19 Kaisar et al. 2013 [51] 1 3 2 2 1 NA 2
20 Kassime & Ejezie, 1982 [52] 2 3 3 2 1 NA 3
21 Loscertales & Brabin, 2006 [22] 2 3 3 2 1 NA 3
22 Lwanira et al. 2015 [53] 1 1 1 2 2 1 1
23 Migot-Nabias et al. 2000 [54] 2 1 1 2 1 2 1
24 Migot-Nabias et al. 2006 [55] 2 1 1 2 1 2 1
25 Missinou et al. 2003 [56] 2 1 2 2 1 2 1
26 Nwauche et al. 2011 [57] 2 3 3 2 1 NA 3
27 Ojurongbe et al. 2011 [17] 2 3 3 2 1 NA 3
28 Panda et al. 2012 [12] 2 3 2 2 1 NA 2
29 Panda et al. 2011 [58] 2 3 2 2 1 NA 2
30 Pant et al. 1992a [59] 2 3 3 2 1 NA 3
31 Pant et al. 1992b [60] 2 3 3 2 1 NA 3
32 Pant et al. 1997 [61] 2 3 3 2 1 NA 3
33 Pathirana et al. 2004 [62] 2 3 3 1 1 NA 3
34 Rabha et al. 2012 [63] 2 3 3 2 1 NA 3
35 Senga et al. 2007 [23] 2 3 3 2 2 NA 3
36 Singh et al. 1995 [64] 2 1 2 2 1 2 1
37 Tadesse & Tadesse, 2013 [14] 2 3 3 2 1 NA 3
38 Tekeste & Petros, 2010 [65] 2 3 3 2 1 NA 3
39 Thakur & Verma, 1992 [66] 2 3 3 2 1 NA 3
40 Ukaga et al. 2007 [67] 2 3 3 2 1 NA 3
41 Uneke et al. 2006 [68] 2 3 3 2 1 NA 3
42 Zerihun et al. 2011 [13] 2 3 3 2 1 NA 3
  1. 1 = strong; 2 = moderate; 3 = weak; NA = not applicable