| Positive | Negative |  |  |  |  |
---|---|---|---|---|---|---|
Parameter | N = 196 | N = 550 | χ 2 | P | OR | 95% CI |
Sex (male:female) | 101:95 | 252:298 | 1.892 | 0.169 | 1.257 | 0.907–1.743 |
Setting |  |  | 2.124 | 0.145 | 0.608 | 0.309–1.194 |
 Inpatient | 11 (5.6) | 49 (8.9) | – | – | – | – |
 Outpatient | 185 (94.4) | 501 (91.1) | – | – | – | – |
Age |  |  | 5.963 | 0.199 | – | – |
 ≤5 | 10 (5.1) | 37 (6.7) | – | – | – | – |
 6–15 | 2 (1.0) | 12 (2.2) | – | – | – | – |
 16–40 | 117 (59.7) | 275 (50.0) | – | – | – | – |
 41–60 | 46 (23.5) | 145 (26.4) | – | – | – | – |
 >60 | 21 (10.7) | 81 (14.7) | – | – | – | – |
Fever (>38 °C) |  |  | 1.855 | 0.173 | 0.638 | 0.333–1.224 |
 Yes | 12 (6.1) | 51 (9.3) | – | – | – | – |
 No | 184 (93.9) | 499 (90.7) | – | – | – | – |
Vomiting |  |  | 1.371 | 0.242 | 1.274 | 0.849–1.911 |
 Yes | 42 (21.4) | 97 (17.6) | – | – | – | – |
 No | 154 (78.6) | 453 (82.4) | – | – | – | – |
Stool type |  |  | 4.039 | 0.097 | – | – |
 Watery | 194 (99.0) | 527 (95.8) | – | – | – | – |
 Bloody | 0 (0) | 5 (0.9) | – | – | – | – |
 Non-watery, non-bloody | 2 (1.0) | 18 (3.3) | – | – | – | – |
Diarrhea (times/day) |  |  | 0.256 | 0.880 | – | – |
 3–4 | 97 (49.5) | 261 (47.5) | – | – | – | – |
 5–9 | 82 (41.8) | 241 (43.8) | – | – | – | – |
 ≥10 | 17 (8.7) | 48 (8.7) | – | – | – | – |
Abdominal pain |  |  | 6.551 | 0.010 | 1.932 | 1.159–3.220 |
 Yes | 176 (89.8) | 451 (82.0) | – | – | – | – |
 No | 20 (10.2) | 99 (18.0) | – | – | – | – |