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Table 2 Excluded studies

From: Age of introduction of first complementary feeding for infants: a systematic review

Study (design)

Reason behind exclusion

Adu-Afarwuah et al. 2007 [28] (RCT)

Age of introduction of solids > 6 mo

Bisimwa et al. 2012 [29] (RCT)

Age of introduction of solids > 6 mo

Fewtrell et al. 2012 [30] (RCT)

Age of introduction of solids > 6 mo

Gibson et al. 2011 [31] (RCT)

Age of introduction of solids > 6 mo

Hambidge et al. 2004 [32] (RCT)

Age of introduction of solids > 6 mo

Krebs et al. 2011 [33] (RCT)

Age of introduction of solids > 6 mo

Ly et al. 2006 [34] (RCT)

No EBF group (no control group)

Martin-Calama et al. 1997 [35] (RCT)

Age of introduction of solids < 4 mo

Mehta et al. 1998 [36] (RCT)

Age of introduction of solids < 4 mo

Mosley et al. 2001 [37] (RCT)

Preterm infants

Nicoll et al. 1982 [38] (RCT)

Newborn infants

Ojofeitimi and Elegbe 1982 [39] (RCT)

Newborn infants

Phuka et al. 2008 [40] (RCT)

Age of introduction of solids > 6 mo

Rivera et al. 2004 [41] (RCT)

Age of introduction of solids non specified

Roy 2006 [42] (RCT)

Age of introduction of solids > 6 mo. Malnourished infants

Sachdev et al. 1991 [43] (RCT)

Water supplementation. Infants age <4 mo

Saleem 2010 [44] (RCT)

Age of introduction of solids > 6 mo

Sarker 2009 [45] (RCT)

Age of introduction of solids > 6 mo. No EBF group

Schutzman et al. 1986 [46] (RCT)

Newborn infants

Simondon et al. 1996 [47] (RCT)

No EBF group

Ziegler et al. 2009 [48] (RCT)

Non EBF

Ahmed et al. 1993 [49]

Age of introduction of solids < 4 mo

Armar-Klemesu et al. 1991 [50]

Age of introduction of solids non specified

Arvas et al. 2000 [51]

Medicinal iron supplementation

Baker et al. 2004 [52]

Age of introduction of solids < 4 mo

Baird et al. 2008 [53]

Mixed feeding (formula + BM)

Calvo et al. 1992 [54]

Age of introduction of solids was at 6 mo for both groups

Castro et al. 2009 [55]

Mixed feeding (formula + BM), no data on postnatal birth wt and conditions

Chantry et al. 2007 [56]

Non EBF (other foods introduced)

Domellöf et al. 2001 [57]

Age of introduction of solids > 6 mo, medicinal iron supplementation

Dube et al. 2010 [58]

No analysis on early vs late introduction of solids among the groups

Durá Travé & Diaz Velaz 2002 [59]

Early weaned group had mixed feeding (formula + BM)

Eissa et al. 1990 [60]

Age of introduction of solids non specified

Filipiak et al. 2007 [61]

Mixed feeding (formula + BM), no EBF group

Forsyth et al. 1993 [62]

Age of introduction of solids < 4 mo

Freeman et al. 1998 [63]

Mixed feeding (formula + BM)

Gray 1996 [64]

Mixed feeding (formula + BM)

Haschke & van’t Hof 2000 [65]

Age of introduction of solids < 4 mo

Heinig et al. 1993 [66]

Mixed feeding (formula + BM), age of introduction of solids = or > 6 months

Hokama 1993 [67]

No analysis on association between age of introduction of solids and iron parameters

Kajosaari & Saarinen 1983 [68]

Age of introduction of solids < 4 mo

Kajosaari 1991 [69]

Age of introduction of solids < 4 mo

Kikafunda et al. 2009 [70]

Age of introduction of solids > 6 mo

Kramer et al. 2011 [71]

Age of introduction of solids at 1, 2, 3 mo

Lartey et al. 1999 [72]

Age of introduction of solids > 6 mo

López-Alarcón et al.1997 [73]

Age of introduction of solids < 4 mo

Marlin et al. 1980 [74]

Age of introduction of solids < 4 mo

Marquis et al. 1997 [75]

Infants age group 12-15 mo

Messiah et al. 2012 [76]

Non specific information on how exclusive breastfeeding in BF and in CF groups

Nielsen et al.1998 [77]

No analysis on association between age of introduction of solids among EBF and growth

Piwoz et al. 1996 [78]

Age of introduction of solids < 4 mo

Popkin et al. 1990 [79]

Age of introduction of solids non specified

Quigley et al. 2009 [80]

No analysis on the type of milk received by CF group

Rowland et al. 1988 [81]

Age of introduction of solids non specified

Saarinen & Siimes 1978 [82]

Age of introduction of solids < 4 mo. Mixed feeding (formula + BM)

Salmenpera et al. 1985 [83]

Age of introduction of solids < 4 mo

Simondon & Simondon 1997 [84]

Age of introduction of solids < 4 mo

Sloan et al. 2008 [85]

Age of introduction of solids < 4 mo

Victora et al. 1998 [86]

Age of introduction of solids < 4 mo, low birth weight infants included in the analysis

Wilson et al. 1998 [87]

Age of introduction of solids < 4 mo

Wilson et al. 2006 [88]

Age of introduction of solids < 4 mo

Zhou et al. 2012 [89]

Age of introduction of solids > 6 mo

  1. N.B: CF complementary feeding, EBF exclusively breastfeeding, mo month