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Table 1 Demographic characteristics of the study children.

From: Impact on respiratory tract infections of heptavalent pneumococcal conjugate vaccine administered at 3, 5 and 11 months of age

Characteristics PCV-7 group (n = 811) Control group (n = 744) P
Males (%) 476 (58.7) 413 (55.5) 0.22
Age at vaccination, median days (range)    
First dose 82 (75–104) 82 (76–103) 0.96
Second dose 140 (128–155) 143 (130–158) 0.93
Third dose 340 (328–361) 343 (331–364) 0.92
Breast-feeding for at least three months, No. (%) 551 (67.9) 476 (64.1) 0.11
Living in urban area, No. (%) 527 (65.0) 498 (66.9) 0.44
Mother's age, median years (range) 33 (24–49) 33 (20–46) 0.96
Father's age, median years (range) 35 (21–50) 35 (21–51) 0.99
No. of persons in household, median (range) 3 (2–4) 3 (2–4) 1.00
No. of siblings, median (range) 1 (0–2) 1 (0–2) 1.00
Children with a smoker in the family, No. (%) 194 (23.9) 182 (24.5) 0.84
Children attending day-care, No. (%) 284 (35.0) 231 (31.0) 0.10
Duration of day care attendance, No. (%)    
0–6 months 79 (9.7) 65 (8.7) 0.55
7–12 months 33 (4.1) 44 (5.9) 0.11
13–18 months 111 (13.7) 94 (12.6) 0.59
19–24 months 78 (9.6) 58 (7.8) 0.23
Vaccinated against influenza, No. (%) 12 (1.5) 10 (1.3) 0.99
  1. No significant between-group differences.