Outcome at T2

Group

Outcome at T3

OR

Group difference (exact test)

Positive

(Imp3 = 1)

Non-positive (Imp3 = 0)

Subtotal

Positive %

Positive (Imp2 = 1)

Experimental

Control

8

9

2

7

10

16

80.0

56.3

3.11

p = 0.399

Subtotal

17

9

26

65.4

Non-positive (Imp2 = 0)

Experimental

Control

11

7

22

50

33

57

33.3

12.3

3.57

p = 0.027

Subtotal

18

72

90

20.0

Total

Experimental

Control

19

16

24

57

43

73

44.2

21.9

2.82

p = 0.020

Subtotal

35

81

116

30.2

Dependence of OR on Imp2 (Breslow-Day’s test)

Effect of intervention (Mantel-Haenszel’s estimation)

Chi-square

Probability

Common OR of positive outcome

95% CI of common OR

0.016

0.899

(n.s.)

3.44

1.36 - 8.70