Table 2.
Incidence rate ratios for TB among HWs by year (2002–2012)
| Year | HCW Person Years (FTE) a |
Observed Cases | Expected Cases | Incidence in General Population (per 100,000) b |
Incidence in Healthcare Workers (per 100,000) |
Incidence Rate Ratio (95% CI) |
P-Value c |
|---|---|---|---|---|---|---|---|
| 2002 | 13,473 | 80 | 34 | 248·5 | 593·8 | 2·35 (1·88–2·91) | <0·001 |
| 2003 | 13,964 | 198 | 77 | 552·2 | 1417·9 | 2·57 (2·23–2·95) | <0·001 |
| 2004 | 15,101 | 255 | 98 | 648·2 | 1688·6 | 2·60 (2·30–2·94) | <0·001 |
| 2005 | 16,448 | 365 | 117 | 708·1 | 2219·1 | 3·12 (2·81–3·45) | <0·001 |
| 2006 | 16,391 | 362 | 129 | 787·6 | 2208·5 | 2·81 (2·53–3·11) | <0·001 |
| 2007 | 16,641 | 371 | 136 | 815·1 | 2229·4 | 2·73 (2·46–3·02) | <0·001 |
| 2008 | 16,722 | 326 | 149 | 891·6 | 1949·5 | 2·19 (1·96–2·44) | <0·001 |
| 2009 | 16,404 | 157 | 138 | 842·1 | 957·1 | 1·39 (0·97–1·33) | 0·106 |
| 2010 | 16,298 | 203 | 137 | 840·0 | 1245·6 | 1·48 (1·29–1·70) | <0·001 |
| 2011 | 17,973 | 191 | 148 | 822·7 | 1062·7 | 1·29 (1·12–1·49) | <0·001 |
| 2012 | 19,491 | 169 | 148 | 757.0 | 867·1 | 1·14 (0·98–1·32) | 0·084 |
| Overall TB incidence among HWs for study period | 1496·32 | ||||||
aFTE = Full Time Equivalent
bAs reported by the South African National Department of Health (from ETR.Net) and Statistics South Africa
cChi-Square Test