TABLE 1.
Evaluation of associations between HAV immunoconversions and potential risk factorsa
| Characteristic or risk factor (n) | IC (%n) | % IC |
|---|---|---|
| All (1,298) | 20 (1.54) | 100.0 |
| Gender | ||
| Male (548) | 11 (2.01) | 55.0 |
| Female (750) | 9 (1.2) | 45.0 |
| P value | 0.2611 | |
| Age (yr) | ||
| 0–4 (48) | 0 (0) | 0.0 |
| 5–11 (148) | 2 (1.35) | 10.0 |
| 12–19 (209) | 2 (0.96) | 10.0 |
| 20–34 (319) | 4 (1.25) | 20.0 |
| 35 and over (569) | 12 (2.11) | 60.0 |
| P value | 0.8121 | |
| Children under 7 yr | ||
| No (1,140) | 19 (1.67) | 95.0 |
| Yes (158) | 1 (0.63) | 5.0 |
| P value | 0.498 | |
| Undercooked meat consumption | ||
| No (1,263) | 20 (1.58) | 100.0 |
| Yes (34) | 0 (0) | 0.0 |
| P value | 1 | |
| Raw fish consumption | ||
| No (1,248) | 20 (1.6) | 100.0 |
| Yes (49) | 0 (0) | 0.0 |
| P value | 1 | |
| Unknown animal contact | ||
| No (1,214) | 18 (1.48) | 90.0 |
| Yes (48) | 1 (2.08) | 5.0 |
| P value | 0.5239 | |
| Swimming in previous 2 wk | ||
| No (884) | 14 (1.58) | 70.0 |
| Yes (414) | 6 (1.45) | 30.0 |
| P value | 1 | |
| Head immersion swimming | ||
| No (394) | 3 (0.76) | 15.0 |
| Yes (903) | 17 (1.88) | 85.0 |
| P value | 0.1495 | |
| Diarrhea at 10–12 days | ||
| No (1,248) | 19 (1.52) | 95.0 |
| Yes (20) | 0 (0) | 0.0 |
| P value | 1 | |
| Contact with ill people | ||
| No (1,221) | 20 (1.64) | 100.0 |
| Yes (75) | 0 (0) | 0.0 |
| P value | 0.6246 | |
| Allergies | ||
| No (1,127) | 17 (1.51) | 85.0 |
| Yes (171) | 3 (1.75) | 15.0 |
| P value | 0.7394 | |
| Asthma | ||
| No (1,171) | 18 (1.54) | 90.0 |
| Yes (127) | 2 (1.57) | 10.0 |
| P value | 1 | |
| Chronic GI illness | ||
| No (1,224) | 18 (1.47) | 90.0 |
| Yes (74) | 2 (2.7) | 10.0 |
| P value | 0.3173 | |
a
Fisher’s exact test was used to compute two-sided P values. In the table, IC (%n) is the percentage of people who immunoconverted and %IC is the percentage of immunoconversions. Note that 1,298 of the participants (n = 1,298) returned surveys but the numbers for each category may not add up to 1,298 (or 20 immunoconversions) due to nonresponse on individual questionnaires.