Table 1 Demographic characteristics and HIV prevalence among learners in rural KwaZulu-Natal, South Africa

Age

Age (Mean; ± SD; range)

16.4; ± 2.2;13-24

16.6; ± 2.4;12-25

15.7; ± 2.2;12-23

15.1; ± 2.0;12-22

Age groups

n

%

n

%

n

%

n

%

12-14 years

40

17.4

62

23.8

151

31.7

265

44.6

15-16 years

89

38.7

76

29.2

172

36.1

186

31.3

17-18 years

62

27.0

70

26.9

100

21.0

102

17.2

19-25 years

39

17.0

50

19.2

54

11.3

41

6.9

Overall

230

(46.9)

258*

(53.1)

477*

(44.5)

594*

(55.5)

Grade distribution

Grade 8

62

27.0

74

28.5

105

22.0

141

23.7

Grade 9

66

28.7

46

17.7

125

26.2

139

23.3

Grade 10

57

24.8

48

18.5

119

24.9

156

26.2

Grade 11

28

12.2

37

14.2

88

18.4

109

18.3

Grade 12

17

7.4

55

21.2

41

8.6

51

8.6

Overall

230

(46.7)

260*

(52.8)

478

(44.5)

596

(55.5)

HIV prevalence

n

%95%CI

n

%95%CI

n

%95%CI

n

%95%CI

Age specific prevalence

12-14 years

2

5.0(0.4-18.2)

1

1.6(0.1-9.8)

0

0(0.1-3.1)

5

1.9(0.7-4.6)

15-16 years

1

1.1(0.1-7.0)

2

2.6(0.5-10.1)

2

1.2(0.2-4.6)

5

2.7(1.0-6.5)

17-18 years

0

0 (0.2-7.3)

5

7.1(2.7-16.6)

4

4.0(1.3-10.5)

4

3.9(1.3-10.5)

19-25 years

0

0(0.2-11.2)

12

24.0(13.5-36.5)

2

3.7(0.6-13.8)

5

12.2(4.6-27.0)

Grade specific prevalence

Grade 8

3

4.8(1.3-14.4)

2

2.7(0.5-10.3)

1

1.0(0.1-6.0)

2

1.4(0.3-5.6)

Grade 9

0

0 (0.1-6.9)

3

6.5(1.7-18.9)

2

1.6(0.3-6.2)

5

3.6(1.3-6.6)

Grade 10

0

0 (0.2-7.9)

0

0 (-)

1

0.8(0.1-5.3)

6

3.8(1.6-8.6)

Grade 11

0

0 (0.3-15.0)

7

18.9(8.6-35.7)

3

3.4(0.9-10.3)

6

5.5(2.3-12.1)

Grade 12

0

0 (0.5-22.9)

8

14.6(6.9-27.2)

1

2.4(0.1-14.4)

0

0(0.2-8.7)

Crude HIV prevalence

1.3% (95% CI 0-2.8)

7.7% (95% CI 4.5-10.9)

P < 0.001

1.7% (95% CI 0.5-2.8)

3.2% (95% CI 1.8-4.6)

P = 0.12

Weighted HIV prevalence**

1.4% (95% CI 0-2.8)

12.7% (95% CI 7.5-19.3)

2.5% (95% CI 0.1-5.0)

7.0% (95% CI 2.4-12.2)

Crude HIV prevalence

4.7% (95% CI 2.8-6.5)

2.5% (95% CI 1.6-3.5)

Weighted HIV prevalence**

7.6% (95%CI 4.3-10.9)

4.5% (95%CI 2.1- 6.9)