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Table 4 Differences in pregnancies between the arms before and after interventions

From: Comprehensive sexuality education linked to sexual and reproductive health services reduces early and unintended pregnancies among in-school adolescent girls in Zambia

Study Group

Pre-Intervention (2016)

Post-Intervention (2020)

Pre-Post Difference

Difference-in-Differences

Pregnancies

Enrolled AGYW

Rate (per 1 k)

Pregnancies

Enrolled AGYW

Rate (per 1 k)

Pregnancies

Enrolled AGYW

Rate (per 1 k)

p

IRR (95% CI)

p

Arm 1

49

1687

29

43

1588

28

−6

−99

−1

0.949

1.00

Ref.

Arm 2

53

2626

20

19

2561

7

−34

−65

−13

0.174

0.46 (0.33 to 0.63)

< 0.001

Arm 3

51

1584

32

19

1422

13

−32

− 162

−19

0.142

0.66 (0.51 to 0.84)

0.001