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Table 1 Study characteristics

From: Maternal death and obstetric care audits in Nigeria: a systematic review of barriers and enabling factors in the provision of emergency care

Author, year State/zone Recruitment years Setting Study methods Numbers of cases included Numbers of maternal deaths reported Quality score
Maternal deaths
 Ande 2012 [23] Benin, SS 2005–2009 1 teaching hospital Retrospective case record review 184 184 2
 Ezugwu 2009 [24] Enugu, SE 2004–2008 1 teaching hospital Retrospective case record review 54 54 2
 Ozumba 2008 [25] Enugu, SE 2003–2005 1 teaching hospital Case record review 47 47 4
 Omo-Aghoja 2010 [26] Benin, SS 2005–2007 1 teaching hospital Retrospective case record review, inspection of maternity unit and interview of healthcare providers 84 84 4
Near miss
 Oladapo 2005 [27], Oladapo 2007 [28](same data for both papers) Sagamu, SW 2002–2004 1 teaching hospital Retrospective case record review, clinical review panel 255 44 3
 Hunyinbo 2008 [29] Abeokuta, SW 2002–2003 1 teaching hospital Case record review 130 4 4
 Adeoye 2013 [30] Ile Ife, SW 2006–2007 2 teaching hospitals Prospective case record review 75 nr 7
 Olagbuji 2012 [31] Benin, SS 2007–2010 1 teaching hospital Retrospective case record review 263 34 2
Stillbirths
 Ezugwu 2011 [32] Enugu, SE 2009 1 teaching hospital Prospective case record review and interview of mothers 153 nr 3
 Olusanya 2009 [33] Lagos, SW 2005–2007 1 teaching hospital Case record review 602 nr 2
Abortion complications
 Ibrahim 2012 [34] Niger Delta, SS 2007–2010 1 teaching hospital Retrospective case record review 63 3 2
 Raibu 2009 [35] Lagos, SW 2005–2007 1 tertiary hospital Prospective case record review 175 nr 3
 Nwogu-Ikijo 2007 [36] Enugu, SE 2000–2005 1 teaching hospital Retrospective case record review 11 11 2
 Ekanem 2009 [37] Calabar, SS 2003–2004 1 teaching hospital Prospective case record review 126 5 3
Eclampsia/pre-eclampsia
 Adinma 2013 [38] Nnewi, SE 2000–2009 1 teaching hospital Retrospective case record review 46 8 2
 Eke 2011 [39] Anambra, SE 2004–2009 1 tertiary hospital Case record review 212 nr 2
 Agida 2010 [40] Abuja, NC 2005–2008 1 teaching hospital Retrospective case record review 46 5 2
 Kulima 2009 [41] Nguru, NE 2003–2007 1 tertiary hospital Retrospective case record review 224 52 2
 Okafor 2008 [42] Abuja, NC 2001–2005 1 tertiary hospital Retrospective case record review 38 11 3
 Makinde 2009 [43] Ile Ife, SW 2006 1 teaching hospital Prospective case record review 34 4 2
Uterine rupture
 Nyengidiki 2011 [44] Niger delta, SS 2004–2007 1 teaching hospital Retrospective case record review 40 7 2
 Esiki 2011 [45] Ebonyi, SE 2000–2009 1 teaching hospital Retrospective case record review 101 12 3
 Osaikhuwuomwan 2011 [46] Niger delta, SS 2003–2007 1 teaching hospital Retrospective case record review 33 2 2
 Okafor 2006 [47] Enugu, SE 2000–2004 1 teaching hospital Retrospective case record review 23 1 2
 Mbamara 2012 [48] Nnewi, SE 2004–2009 1 teaching hospital Retrospective case record review 25 3 3
Caesarean section
 Onankpa 2009 [49] Sokoto, NW 2006–2007 1 teaching hospital Prospective, unclear data source 216 nr 3
 Ekanem 2008 [50] Calabar, SS 2000–2001 1 teaching hospital Retrospective case record review 349 12 2
 Ozumba 2006 [51] Enugu, SE 2000–2002 1 teaching hospital Retrospective case record review 463 nr 2
 Ojiyi 2012 [52] Orlu, SE 2004–2008 1 teaching hospital Retrospective case record review 358 3 2
 Onah 2005 [53] Enugu, SE; Abuja, NC 2003 2 hospitals Prospective observation of events 224 nr 5
 Faponie 2007 [54] Ile Ife, SW 2005 1 teaching hospital Prospective, unclear data source 641 2 2
Peripartum hysterectomy
 Abasiattai 2013 [55] Uyo, SE 2004–2011 1 teaching hospital Retrospective case record review 28 4 2
 Nwobodo 2012 [56] Sokoto, NW 2005–2010 1 teaching hospital Retrospective case record review 74 9 2
 Rabiu 2010 [57] Lagos, SW 2003–2007 1 teaching hospital Retrospective case record review 57 11 2
 Badjoko 2013 [58] Ile Ife, SW 2001–2010 1 teaching hospital Retrospective case record review 55 10 3
 Omole Ohinsi 2012 [59] Kano, NW 2003–2008 1 teaching hospital Retrospective case record review 30 4 4
Other post partum complications
 Mutihir 2011 [60] Jos, NC 2005–2008 1 teaching hospital Prospective, unclear data source 246 nr 3
 Ajenifuja 2010 [61] Ile Ife, SW 2002–2006 1 teaching hospital Retrospective case record review 112 6 2
 Agwu 2008 [62] Ebonyi, SE 2003–2006 1 teaching hospital Retrospective case record review 30 nr 2
Miscellaneous complications
 Adelaja 2011 [63] Sagamu, SW 2005–2007 1 teaching hospital Retrospective case record review (obstetric emergencies) 262 17 2
 Kalu 2011 [64] Ebonyi, SE 2001–2007 1 teaching hospital Retrospective case record review (umbilical cord prolapse) 46 nr 2
 Lawani 2013 [65] Ebonyi, SE 2002–2012 1 teaching hospital Retrospective case record review (ectopic pregnancy) 205 3 4