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Table 1 Basic information, clinical symptoms and vaccination history of the death group and nondeath group

From: Risk factors associated with death in infants <120 days old with severe pertussis: a case-control study

Characteristic Deaths(n = 15) Nondeaths(n = 44)  
NO. of Patients NO.(%) NO. of Patients NO.(%) P Value
age
 ≤ 1 month 1 6.67% 1 2.27% 0.417
 1-2 month 6 40% 19 43.18% 0.829
 2-3 month 4 26.67% 13 29.55% 0.832
 3-4 month 4 26.67% 11 25.00% 0.898
Male sex 6   26   0.2
weight (kg)   5.13 ± 1.12   5.27 ± 1.07 0.135
premature 4 26.67% 6 13.64% 0.245
Birth weight (kg)   2.96 ± 4.41   3.17 ± 5.07 0.149
Vaccination history 2 (1 dose)   0   
symptoms
 fever 9 60.00% 19 43.18% 0.26
 paroxysmal coughing 14 93.33% 43 97.70% 0.417
 whoop 11 73.30% 23 52.30% 0.154
 apnoea 12 80.00% 14 31.80% 0.001
 cyanosis 15 100% 44 100%  
 Laboratory confirmed 15 100% 44 100%  
  1. Prematurity was defined as birth at < 37 weeks’ gestation
  2. Only 2 infants had received 1 dose of the vaccine (DTaP) in the death group
  3. Fever was defined as a tympanic or axillary temperature >38 °C