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Table 1 Characteristics of included patients and other lab-confirmed influenza patients from surveillance networks in the survey

From: The economic burden of influenza-associated outpatient visits and hospitalizations in China: a retrospective survey

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)