Tuberculin positive rates at different cut-off points by sex and age
| Sex | Age | No | Tuberculin positive rates at different cut-off points (%) | |||||
|---|---|---|---|---|---|---|---|---|
| ⩾5 mm | (95% CI) | ⩾10 mm | (95% CI) | ⩾15 mm | (95% CI) | |||
| *χ2 for trend. | ||||||||
| Girls | 6 | 2476 | 24.27 | (22.67 to 25.96) | 11.59 | (10.33 to 12.85) | 1.86 | (1.33 to 2.39) |
| 7 | 2761 | 26.29 | (24.65 to 27.94) | 14.05 | (12.76 to 15.35) | 2.43 | (1.85 to 3.00) | |
| 8 | 2736 | 29.68 | (27.97 to 31.39) | 15.20 | (13.86 to 16.55) | 2.60 | (2.00 to 3.19) | |
| 9 | 2701 | 32.32 | (30.56 to 34.09) | 16.96 | (15.54 to 18.37) | 2.74 | (2.12 to 3.36) | |
| All | 10674 | 28.22 | (27.36 to 29.07) | 14.51 | (13.84 to 15.18) | 2.42 | (2.13 to 2.71) | |
| p* | <0.001 | <0.001 | 0.04 | |||||
| Boys | 6 | 2340 | 19.02 | (17.43 to 20.61) | 8.76 | (7.61 to 9.91) | 1.41 | (0.93 to 1.89) |
| 7 | 2539 | 19.93 | (18.37 to 21.48) | 9.49 | (8.35 to 10.63) | 1.65 | (1.16 to 2.15) | |
| 8 | 2662 | 23.63 | (22.01 to 25.24) | 11.50 | (10.28 to 12.71) | 2.22 | (1.66 to 2.78) | |
| 9 | 2607 | 25.58 | (23.91 to 27.26) | 13.31 | (12.01 to 14.62) | 2.72 | (2.10 to 3.35) | |
| All | 10148 | 22.14 | (21.33 to 22.95) | 10.83 | (10.23 to 11.43) | 2.02 | (1.75 to 2.29) | |
| p* | <0.001 | <0.001 | <0.001 | |||||
| Overall | 6 | 4816 | 21.72 | (20.55 to 22.88) | 10.22 | (9.36 to 11.07) | 1.64 | (1.28 to 2.00) |
| 7 | 5300 | 23.25 | (22.11 to 24.38) | 11.87 | (11.00 to 12.74) | 2.06 | (1.67 to 2.44) | |
| 8 | 5398 | 26.70 | (25.51 to 27.88) | 13.38 | (12.47 to 14.28) | 2.41 | (2.00 to 2.82) | |
| 9 | 5308 | 29.01 | (27.79 to 30.23) | 15.17 | (14.20 to 16.13) | 2.73 | (2.29 to 3.17) | |
| All | 20822 | 25.26 | (24.67 to 25.85) | 12.72 | (12.26 to 13.17) | 2.22 | (2.02 to 2.42) | |
| p* | <0.001 | <0.001 | <0.001 | |||||