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Table 5 Number of infants vaccinated at admission, monthly cumulative coverage estimates, and VE against pertussis hospitalizations of 1st and 2nd infant dose for preterm and term infants, assessed with the screening method

From: Pertussis hospitalizations among term and preterm infants: clinical course and vaccine effectiveness

  Term infants Preterm infants
Age in months↓ Vaccinated at admission % (n) Coverage in general population Vaccine effectiveness (95% CI)a Vaccinated at admission % (n) Coverage in general population Vaccine effectiveness (95% CI)a
Main analysis
 0 m 0% (0/1) na na 0% (0/1) na na
 1 m 1.4% (2/144) 1.9% na 0% (0/14) 1.3% na
 2 m 34.2% (52/152) 90.9% 95%b (93–96%) 60% (9/15) 84.9% 73%b
(20–91%)
 3 m 85.9% (67/78) 98.8% 93% (85–96%) 86.7% (13/15) 97.9% 86%
(9–96%)
 4 m 93.8% (30/32) 99.4% 91% 100% (4/4) 99.4% na
Sensitivity analysis
 0 m 0% (0/1) na na 0% (0/1) na na
 1 m 0.9% (1/115) 1.9% na 0% (0/14) 1.3% na
 2 m 33.7% (33/98) 90.9% 95%b (92–97%) 60% (9/15) 84.9% 73%b (20–91%)
 3 m 89.4% (42/47) 98.8% 90% (71–96%) 86.7% (13/15) 97.9% 86% (9–96%)
 4 m 100% (14/14) 99.4% na 100% (4/4) 99.4% na
  1. aaccording to the screening method
  2. bsignificant difference between term and preterm infants