Table 3 Baseline comparison of socio-demographic and obstetric and gynaecological characteristics between intervention and control groups

Age (years)

 Mean ( SD)

26.1

(5.8)

26.9

(5.9)

 (Range)

(15–40)

(17–45)

Ethnicity

 Kanuri

73

(37.7)

63

(33.9)

 Hausa

30

(16.1)

28

(15.1)

 Babur

13

(7.0)

18

(9.7)

 Shuwa

6

(3.2)

12

(6.4)

 Marghi

14

(7.5)

12

(6.4)

 Fulani

21

(11.3)

17

(9.1)

 Others

32

(17.2)

36

(19.4)

Family type

 Monogamous

143

(76.9)

144

(77.4)

 Polygamous

41

(22.0)

42

(22.6)

 Widowed

2

(1.1)

0

(0.0)

Educational status

 None

82

(44.1)

71

(38.2)

 Primary

32

(17.2)

32

(17.2)

 Secondary

54

(29.0)

54

(29.0)

 Tertiary

18

(9.7)

29

(15.6)

Employment status

 None

104

(55.9)

101

(54.3)

 Self-employed

56

(30.1)

65

(34.9)

 Government

9

(4.9)

9

(4.9)

 Private

14

(7.5)

10

(5.4)

 Student

3

(1.6)

1

(0.5)

Income

 None

106

(57.0)

102

(54.8)

  < 18,000

65

(34.9)

72

(38.7)

≥ 18,000

15

(8.1)

12

(6.5)

Type of Residence

 Permanent resident

127

(68.3)

147

(79.0)

 IDP

59

(31.7)

39

(21.0)

Age at first marriage

≤ 15

41

(22.0)

35

(18.8)

 16–19

105

(56.5)

100

(53.8)

 20–24

32

(17.2)

40

(21.5)

≥ 25

8

(4.3)

11

(5.9)

Gravidity

 Primigravida

24

(12.9)

24

(12.9)

 Multigravida

96

(51.6)

96

(51.6)

 Grandmultigravida

66

(35.5)

66

(35.5)

Parity

 Nullipara

28

(15.1)

25

(13.4)

 Primi-para

39

(21.0)

40

(21.5)

 Multipara

77

(41.4)

75

(40.3)

 Grandmultipara

42

(22.6)

46

(24.7)

Gestational age at antenatal booking

 4 months

49

(26.3)

65

(34.9)

 5 months

137

(73.7)

121

(65.1)

History of pre-term delivery

 Yes

37

(19.9)

36

(19.4)

 No

149

(80.1)

150

(80.6)

History of miscarriage

 Yes

49

(26.3)

53

(28.5)

 No

137

(73.7)

133

(71.3)