Table 3.
Risk factors for varicella infection in the outbreak, Jiangsu Province, China.
| Variable | Cases n (%) | Controls n (%) |
P-value | Crude OR (OR95% CI) | P-value* | Adjusted OR * (OR 95% CI) |
|
|---|---|---|---|---|---|---|---|
| Age (years) | 8.7 ± 1.4 | 8.7 ± 1.1 | 0.563 | 0.16(0.86–1.32) | 0.512 | 1.04(0.84–1.36) | |
| X ± s | |||||||
| Sex | Female | 23 (45.1) | 43 (42.2) | 0.787 | 1.09 (0.58–2.06) | 0.276 | 1.50 (0.72–3.13) |
| Male | 28 (54.9) | 59 (47.8) | 1 | 1 | |||
| Presence of siblings | Yes | 20 (39.2) | 56 (54.9) | 0.081 | 0.56 (0.29–1.08) | 0.037 | 0.45 (0.21–0.95) |
| No | 31 (60.8) | 46 (45.1) | 1 | 1 | |||
| Region | Locals | 22 (43.1) | 41 (67.2) | 0.776 | 1.08 (0.62–1.89) | 0.663 | 0.82 (0.34–1.99) |
| Outsiders | 29 (56.9) | 61 (32.8) | 1 | 1 | |||
| Contact with varicella patients | Yes | 42 (82.3) | 69 (67.6) | 0.071 | 2.38 (0.93–6.11) | 0.028 | 3.39 (1.14–10.09) |
| No | 9 (17.7) | 33 (32.4) | 1 | 1 | |||
| Transportation to school | Private car | 14 (27.5) | 20 (19.6) | 0.247 | 1.46 (0.77–2.74) | 0.136 | 2.14 (0.79–5.84) |
| School bus | 7 (13.7) | 6 (8.8) | 0.125 | 1.90 (0.84–4.33) | 0.265 | 2.12 (0.57–7.91) | |
| Walking | 30 (58.8) | 76 (71.6) | 1 | 1 | |||
| Frequency of hand washing | Frequently | 8 (15.7 | 18 (17.6) | 0.427 | 0.58 (0.15–2.23) | 0.907 | 0.91 (0.19–4.24) |
| Sometimes | 30 (58.8) | 64 (62.7) | 0.347 | 0.69 (0.28–1.58) | 0.333 | 0.61 (0.22–1.67) | |
| Seldom | 13 (25.5) | 20 (19.7) | 1 | 1 | |||
| Vaccination status | One-dose | 26 (51) | 83 (81.4) | <0.001 | 0.25 (0.11–0.5) | <0.001 | 0.19 (0.08–0.45) |
| Unvaccinated | 25 (49) | 19 (18.6) | 1 | 1 | |||
*Adjusted for the presence of siblings, contact with varicella patients and vaccination status.