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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