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Table 1 Maternal characteristics in relation to interpregnancy interval (n = 17,030 births)

From: Effect of interpregnancy interval on adverse pregnancy outcomes in northern Tanzania: a registry-based retrospective cohort study

Characteristics

Interpregnancy interval (month)

<24

(n = 3309)

24–36

(n = 5774)

37–59

(n = 5509)

≥60

(n = 2442)

Maternal age (years)

  ≤ 19

113 (3.41)

111 (1.92)

20 (0.36)

3 (0.12)

 20–34

2750 (83.11)

4826 (83.58)

4384 (79.57)

1503 (61.55)

  ≥ 35

446 (13.48)

837 (14.49)

101 (1.83)

936 (38.33)

Mothers education (years)

  < 12

2120 (64.06)

4073 (70.54)

3958 (71.84)

1757 (71.95)

  ≥ 12

1189 (35.94)

1701 (29.46)

1547 (28.16)

685 (28.05)

Marital status

 Single

148 (4.47)

257 (4.45)

267 (4.85)

239 (9.79)

 Married

3161 (95.53)

5517 (95.55)

5238 (95.15)

2203 (90.21)

Paritya

 1

1905 (57.57)

2839 (49.17)

2480 (45.02)

1006 (41.19)

 2

666 (20.12)

1466 (25.39)

1560 (28.32)

744 (30.47)

 ≥3

659 (22.31)

1333 (25.44)

1320 (26.66)

612 (28.34)

Number of ANC visitsa

  < 4

1127 (34.06)

2018 (34.95)

1638 (29.73)

786 (32.19)

  ≥ 4

2182 (65.94)

3756 (65.05)

3867 (70.27)

1656 (67.81)

Mothers area of residence

 Rural

1317 (39.80)

2582 (44.72)

2143 (38.89)

896 (36.69)

 Urban

1992 (60.20)

3192 (55.28)

3362 (61.11)

1546 (63.31)

Occupationa

 Unemployed

2611 (78.91)

4841 (83.84)

4740 (86.04)

2078 (85.09)

 Employed

687 (20.09)

904 (15.66)

739 (13.96)

349 (14.91)

Alcohol use during pregnancy

1133 (34.24)

2268 (39.28)

2372 (43.07)

1035 (42.38)

Use of family planning methods

933 (28.19)

460 (7.96)

248 (4.50)

183 (7.49)

Pregnancy BMI (kg/m2)a

 Underweight (<18.5)

5 (0.15)

18 (0.31)

13 (0.24)

7 (0.29)

 Normal (18.5–24.9)

1647 (49.77)

2901 (50.24)

2693 (48.88)

1064 (43.57)

 Overweight (25–29.9)

827 (24.99)

1497 (25.93)

1377 (24.88)

609 (24.94)

 Obese (≥30)

427 (25.09)

607 (23.52)

737 (26.0)

43 (31.20)

  1. Values in brackets are percentage of births in each IPI category
  2. aNumbers do not add to total because of missing data