Characteristic | Included patients in the survey | Other lab-confirmed influenza patients from surveillance networks | Test for difference in groups | p-value |
---|---|---|---|---|
(n = 783) | (n = 39269) | |||
Median age, years (inter-quartile range) | 7 (3–15) | 9 (4–27) | Rank-sum test | <0.001 |
Age group, years (%) | Chi-square test | <0.001 | ||
< 5 | 266 (34.0) | 11854 (30.2) | ||
5–14 | 311 (39.7) | 12113 (30.8) | ||
15–59 | 187 (23.9) | 13653 (34.8) | ||
≥ 60 | 19 (2.4) | 1649 (4.2) | ||
Male (%) | 428 (54.7) | 21568 (54.9) | Chi-square test | 0.913 |
Region (%) | Chi-square test | <0.001 | ||
North China | 45 (5.7) | 4181 (10.6) | ||
Northeast China | 3 (0.4) | 2000 (5.1) | ||
East China | 374 (47.8) | 13136 (33.5) | ||
Central China | 119 (15.2) | 5132 (13.1) | ||
South China | 95 (12.1) | 7190 (18.3) | ||
Southwest China | 92 (11.7) | 4470 (11.4) | ||
Northwest China | 55 (7.0) | 3160 (8.0) | ||
Hospital (%) | Chi-square test | <0.001 | ||
Level 1 and lower | 131 (16.7) | 2666 (6.8) | ||
Level 2 | 177 (22.6) | 9964 (25.4) | ||
Level 3 | 475 (60.7) | 26623 (67.8) | ||
Unknown | 0 (0) | 16 (0) |