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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)