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Table 1 Demographic characteristics of the study children.
| 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 |
