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

From: HIV prevalence among high school learners - opportunities for schools-based HIV testing programmes and sexual reproductive health services

Variable School A (N = 492)   School B (N = 1074)  
  Boys Girls   Boys Girls  
Demographic characteristics
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)  
  1. * Missing values were excluded from percentage calculation
  2. ** weighted to the 12-24 year old 2010 mid-year population estimates for the province of KwaZulu-Natal provided by Statistics South Africa [7].