Table 1 Abortion proportions across the study years and estimated risk factors

Parity

‘_’

Null/primi

54/155

34.8 (0.27–0.43)

27/65

41.5 (0.29–0.54)

7/48

14.6 (0.06–0.28)

88/273

32.2 (0.26–0.38)

Multiparous

99/405

24.4 (0.20–0.29)

102/279

36.5 (0.31–0.43)

3/28

10.7 (0.02–0.28)

204/707

28.8 (0.25–0.32)

Year

‘***’

2013/14

11/71

15.5 (0.08–0.26)

6/45

13.3 (0.05–0.26)

2/2

100(0.16-1)

19/118

16.1 (0.01–0.24)

2014/15

26/82

31.7 (0.22–0.43)

19/42

45.2 (0.29–0.61)

5/14

35.7 (0.13–0.65)

49/137

35.7 (0.27–0.44)

2015/16

30/78

38.5 (0.27–0.50)

20/43

46.5 (0.31–0.62)

0/5

0 (0.00-0.52)

50/126

39.7 (0.31–0.49)

2016/17

32/85

37.6 (0.27–0.49)

26/52

50 (0.36–0.64)

0/8

0 (0.00-0.37)

58/146

39.7 (0.32–0.48)

2017/18

25/88

28.4 (0.19–0.39)

21/54

38.9 (0.26–0.53)

3/18

16.7 (0.04–0.41)

49/160

30.6 (0.24–0.38)

2018/19

20/90

22.2 (0.14–0.32)

23/57

40.4 (0.27–0.54

0/16

0 (0.00-0.21)

43/163

26.4 (0.19–0.34)

2019/20

11/67

16.4 (0.08–0.27)

14/51

27.5 (0.16–0.42)

0/13

0 (0.00-0.25)

24/130

18.5 (0.12–0.26)

Season

‘***’

Wet

47/213

22.1 (0.17–0.28)

35/132

26.5 (0.19–0.35)

2/23

8.7 (0.01–0.28)

84/368

22.8 (0.18–0.27)

Dry

106/547

19.4 (0.16–0.23)

94/212

44.3 (0.37–0.51)

8/53

15.1 (0.07–0.27)

208/612

34 (0.30–0.38)

Age

‘*’

≤ 2 year

52/143

36.4 (0.28–0.45)

26/61

42.6 (0.30–0.56)

5/24

20.8 (0.07–0.42)

83/228

36.4 (0.30–0.43)

> 2 year

101/417

24.2 (0.20–0.28)

103/283

36.4 (0.31–0.42)

5/52

9.6 (0.03–0.21)

209/752

27.8 (0.25–0.31)

Total

153/560

27.3 (0.24–0.31)

129/344

37.5 (0.32–0.43)

10/76

13.2 (0.06–0.23)

292/980

29.8 (0.27–0.33)