Table 1 The incidence and 95% CI of foodborne acute gastroenteritis among participants
| Â | Foodborne gastro-enteritis (n) | Total Participants (n) | Monthly incidence | X2 | P | |
|---|---|---|---|---|---|---|
% | (95% CI) | |||||
Total | 165 | 1516 | 10.9 | (9.4–12.6) |  |  |
Gender | ||||||
 male | 64 | 856 | 7.5 | (5.5–9.2) | 23.534 | < 0.001 |
 female | 101 | 660 | 15.3 | (12.6–18.0) |  |  |
Age (years) | ||||||
  ≤ 17 | 12 | 76 | 15.8 | (7.9–23.7) | 49.264 | < 0.001 |
 18~ | 54 | 567 | 9.5 | (7.1–12.0) |  |  |
 30~ | 45 | 315 | 14.3 | (10.5–18.1) |  |  |
 40~ | 18 | 405 | 4.4 | (2.5–6.4) |  |  |
  ≥ 50 | 36 | 153 | 23.5 | (17.0–30.7) |  |  |
Education | ||||||
 primary school and below | 36 | 381 | 11.3 | (7.9–14.8) | 11.116 | 0.011 |
 junior high school | 49 | 387 | 12.7 | (9.6–16.0) |  |  |
 high school | 60 | 476 | 12.6 | (9.5–15.5) |  |  |
 bachelor and above | 20 | 335 | 6.0 | (3.6–8.7) |  |  |
Total annual income (CNY) | ||||||
  < 30,000 | 31 | 259 | 12.0 | (8.1–15.8) | 12.033 | 0.007 |
 30,000–49,999 | 31 | 299 | 10.4 | (7.0–14.0) |  |  |
 50,000–89,999 | 65 | 452 | 14.4 | (11.3–17.7) |  |  |
  ≥ 90,000 | 38 | 506 | 7.5 | (5.3–9.2) |  |  |
Residence | ||||||
 urban | 49 | 641 | 7.6 | (5.9–9.8) | 12.017 | 0.001 |
 rural | 116 | 875 | 13.3 | (11.0–15.7) |  |  |
Occupation | ||||||
 students and children | 10 | 72 | 13.9 | (6.9–22.2) | 8.233 | 0.312 |
 service personal | 18 | 153 | 11.8 | (7.2–17.6) |  |  |
 teacher | 9 | 135 | 6.7 | (3.0–11.1) |  |  |
 medical staff | 18 | 234 | 7.7 | (4.3–11.5) |  |  |
 peasant worker | 38 | 290 | 13.1 | (9.3–16.6) |  |  |
 peasant | 27 | 207 | 13.0 | (8.7–17.4) |  |  |
 worker | 18 | 171 | 10.5 | (5.8–15.2) |  |  |
 other or unknown | 27 | 254 | 10.6 | (7.5–14.6) |  |  |