Time

Outcome

Experimental group

Control group

Total

Group difference (exact test)

OR

n

(%)

n

(%)

n

(%)

T2

Positive

Non-positive

(Imp2 = 1)

(Imp2 = 0)

12

42

(22.2)

(77.8)

21

69

(23.3)

(76.7)

33

111

(22.9)

(77.1)

p = 1.000

0.94

Total

54

(100.0)

90

(100.0)

144

(100.0)

T3

Positive

Non-positive

(Imp3 = 1)

(Imp3 = 0)

19

25

(43.2)

(56.8)

20

67

(23.0)

(77.0)

39

94

(29.3)

(70.7)

p = 0.025

2.53

Total

44

(100.0)

87

(100.0)

133

(100.0)