Table 1.
Comparison of miners by inclusion in the analysis and by HIV status
| Included in analysis | No records of time off | |||||||||
| Factor | HIV-positive | HIV-negative | Total | |||||||
| n | % | n | % | p Value* | n | % | n | % | p Value† | |
| Total | 1703 | 4859 | 6562 | 1202 | ||||||
| Age (years) at start of study | <0.001 | <0.001 | ||||||||
| 15–24 | 264 | 15.5 | 555 | 11.4 | 819 | 12.5 | 117 | 9.7 | ||
| 25–34 | 966 | 56.7 | 2466 | 50.8 | 3432 | 52.3 | 475 | 39.6 | ||
| 35–44 | 395 | 23.2 | 1433 | 29.5 | 1828 | 27.9 | 257 | 21.4 | ||
| 45+ | 78 | 4.6 | 405 | 8.3 | 483 | 7.4 | 352 | 29.3 | ||
| South African | 835 | 49.0 | 2523 | 51.9 | 0.04 | 3358 | 51.2 | 636 | 53.0 | 0.26 |
| Calendar year of study recruitment | <0.001 | <0.001 | ||||||||
| ≤1992 | 426 | 25.0 | 1816 | 37.4 | 2242 | 34.2 | 450 | 37.4 | ||
| 1993 | 338 | 19.9 | 3043 | 62.6 | 3381 | 51.5 | 634 | 52.8 | ||
| 1994+ | 939 | 55.1 | 0 | 0 | 939 | 14.3 | 118 | 9.8 | ||
| Still employed in 2002 | 444 | 26.1 | 1855 | 38.2 | <0.001 | 2299 | 35.0 | 110 | 9.2 | <0.001 |
| HIV-positive | – | – | 1703 | 26.0 | 247 | 20.6 | <0.001 | |||
| Median (IQR) study follow-up, years | 4.9 (2.5 to 7.0) | 6.6 (4.0 to 9.4) | <0.001 | 6.0 (3.3 to 9.3) | 4.8 (2.5 to 5.9) | <0.001 | ||||
| Median (IQR) follow-up, years (primary analysis) | 3.4 (1.9 to 5.6) | 5.4 (3.2 to 9.3) | <0.001 | 5.0 (2.5 to 8.7) | ||||||
*
p Value from test comparing HIV-positive and HIV-negative miners.
†
p Value from test comparing those included and excluded from the analysis.