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Table 3 The case-severity rate in different groups

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

Groups Severe (n) Mild (n) Case-severe rate (%) OR (95%CI) χ 2 p
Reinfection cases     1.969 (1.458–2.660) 20.263 < 0.001a
 Primary infection 128 6342 1.98 1.329 (1.107–1.594) 9.406 0.002b
 Second infection 65 6405 1.01 0.675 (0.526–0.866) 9.674 0.002c
Non-reinfection cases 1507 99,700 1.49 1.000   
  1. aThe P value was primary infection group compares with second infection group
  2. bThe P value was primary infection group compares with non-reinfection group
  3. cThe P value was second infection group compares with non-reinfection group