|  | 2009–11 |  |  | 2012–16 |  |  |
---|---|---|---|---|---|---|---|
 | n (%) | Proportion of Guangdong population a | Averaged incidence (Cases reported per 100,000) | n (%) | Proportion of Guangdong population a | Averaged incidence (Cases reported per 100,000) | p-value b |
Overall | 3194 | Â | Â | 19,168 | Â | Â | Â |
Sex | |||||||
 Male | 1853 (58.0%) | 52.0% | 1.18 | 11,264 (58.8%) | 52.5% | 4.01 | 0.43 |
 Female | 1341 (42.0%) | 48.0% | 0.90 | 7904 (41.2%) | 47.5% | 3.10 | |
Household registration c | |||||||
 Local | 1777 (55.6%) | 79.4% | 0.72 | 13,000 (67.8%) | 76.1% | 3.17 | < 0.01 |
 Non-local | 951 (29.8%) | 20.6% | 1.47 | 6084 (31.7%) | 23.8% | 4.90 | |
Age groups | |||||||
 0–8 months | 548 (17.2%) | 0.8% | 22.71 | 5862 (30.6%) | 0.8% | 142.24 | < 0.01 |
 9–23 months | 769 (24.1%) | 1.5% | 16.40 | 4551 (23.7%) | 1.7% | 49.09 | 0.68 |
 2–6 years | 473 (14.8%) | 4.8% | 3.12 | 2646 (13.8%) | 5.2% | 9.61 | 0.13 |
 7–15 years | 315 (9.9%) | 14.1% | 0.63 | 761 (4.0%) | 10.4% | 1.37 | < 0.01 |
 16–24 years | 558 (17.5%) | 18.0% | 1.03 | 1431 (7.5%) | 19.2% | 1.39 | < 0.01 |
 ≥ 25 years | 531 (16.6%) | 60.7% | 0.29 | 3917 (20.4%) | 62.7% | 1.16 | < 0.01 |