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Table 1 Repeated infection rate of HFMD population of different features in Wuxi city

From: Epidemiological characteristics and influential factors of hand, foot, and mouth disease reinfection in Wuxi, China, 2008–2016

Characteristics Case (n) Reinfection (n) Non-Reinfection (n) Refection rate (%) χ2 P
Sex      36.686 < 0.001
 Male 63,671 4058 59,613 6.37   
 Female 44,006 2412 41,594 5.48   
Age (year)      1138.277 < 0.001
 0 7087 684 6403 9.65   
 1 28,202 2397 25,805 8.50   
 2 20,745 1377 19,368 6.64   
 3 20,814 1159 19,655 5.57   
 4 15,134 589 14,545 3.89   
  ≥ 5 15,695 264 15,431 1.65   
status      572.368 < 0.001
 Scattered children 67,122 4857 62,265 7.24   
 Kindergartens children 36,024 1581 34,443 4.39   
 School students 4149 32 4117 0.77   
 Others 382 0 382 0   
Residence      6.729 0.009
 Rural 45,397 2627 42,770 5.79   
 Urban 62,280 3843 58,437 6.17   
Clinical classification      9.738 0.002
 Mild 106,042 6342 99,700 5.98   
 Severe 1635 128 1507 7.83