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Table 1 Social and demographic characteristics according to clinical classification

From: Misclassification and characterization of exposure to humidifier disinfectants using a questionnaire

Characteristics Class 1 Class 2 Class 3 Class 4 Indetermination Total p-value
N (%) N (%) N (%) N (%) N (%) N (%)
Total 4351 83.0 281 5.4 204 3.9 264 5.0 145 2.8 5245 100.0  
Sex              < 0.01
 Male 2285 85.4 113 4.2 89 3.3 146 5.5 70 2.6 2675 100.0  
 Female 2063 81.0 168 6.6 115 4.5 118 4.6 55 2.2 2547 100.0  
 Unknown 3 13.0 0 0.0 0 0.0 0 0.0 20 87.0 23 100.0  
Survival status < 0.01
 Survival 3479 86.4 215 5.3 133 3.3 72 1.8 72 1.8 4027 100.0  
 Death 872 71.6 66 5.4 71 5.8 73 6.0 73 6.0 1218 100.0  
Age at damage (years) < 0.01
  < 10 1088 70.8 142 9.2 106 6.9 145 9.4 55 3.6 1536 100.0  
 10s 117 91.4 3 2.3 1 0.8 3 2.3 4 3.1 128 100.0  
 20s 299 89.0 10 3.0 8 2.4 12 3.6 7 2.1 336 100.0  
 30s 755 82.3 41 4.5 33 3.6 72 7.9 16 1.7 917 100.0  
 40s 467 91.2 20 3.9 12 2.3 6 1.2 7 1.4 512 100.0  
 50s 501 91.3 18 3.3 14 2.6 8 1.5 8 1.5 549 100.0  
 60s 459 91.8 18 3.6 12 2.4 4 0.8 7 1.4 500 100.0  
 70s 240 92.7 12 4.6 3 1.2 1 0.4 3 1.2 259 100.0  
  ≥ 80 53 94.6 1 1.8 0 0.0 0 0.0 2 3.6 56 100.0  
 Unknown 372 82.3 16 3.5 15 3.3 13 2.9 36 8.0 452 100.0  
Susceptible group < 0.01
 Pregnant women 261 77.0 10 3.0 18 5.3 44 13.0 6 1.7 339 100.0  
 Fetus 311 70.8 42 9.6 30 6.8 17 3.9 39 8.9 439 100.0  
Others 3779 84.6 229 5.1 156 3.5 203 4.6 100 2.2 4467 100.0