BEFORE (n = 484)

AFTER (n = 441)

Knowledge variables

N

%

P

N

%

OR

IC

P

Knowledge of at least three signs of STIs

Control

159

34.6

149

36.9

1

0.000

Intervention A

153

32.0

0.890

143

44.8

1.38

0.84 - 2.27

Intervention B

172

35.1

149

64.4

3.10

1.87 - 5.11

Knowledge of the three prevention modes of HIV/AIDS

Control

159

36.5

0.589

149

39.6

1

0.000

Intervention A

153

39.2

143

76.2

4.90

2.87 - 8.40

Intervention B

172

33.7

149

79.8

6.05

3.50 - 10.53

Knowledge of pregnancy prevention using the menstrual calendar

Control

159

64.2

0.918

149

65.1

1

0.012

Intervention A

153

64.1

143

76..2

1.71

0.99 - 2.97

Intervention B

172

62.2

149

79.7

2.11

1.21 - 3.70

Attitudes variables

Be favorable to do the HIV test

Control

159

49.0

0.645

142

50.3

1

0.000

Intervention A

153

49.0

141

61.8

1.58

0.97 - 2.60

Intervention B

172

53.0

149

73.2

2.68

1.61 - 4.4

Dialogue with parents on HIV/STIs and pregnancy issues

Control

159

14.8

0.000

159

12.6

1

0.000

Intervention A

153

50.9

153

44.0

5.38

2.91 - 10.20

Intervention B

172

50.6

172

63.1

11.7

6.31 - 22.14

Practice variables

Having no had sex in the past 3 months

Control

159

64.2

0.202

149

37.6

1

0.000

Intervention A

153

64.1

143

42.7

1.23

0.75 - 2.03

Intervention B

172

72.1

149

69.8

3.84

2.31 - 6.40

Having had protected sex with condom use

Control

43

25.6

0.182

71

22.5

1

0.003

Intervention A

55

43.6

82

37.8

2.10

0.97 - 4.59

Intervention B

48

35.4

45

53.3

3.93

1.63 - 9.56