Characteristics | A/H1N1/2009-positive children admitted because of ILI(n=51) | A/H1N1/2009-negative children admitted because of ILI(n=221) | Healthy controls (n=164) |
---|---|---|---|
Males, No. (%) | 27 (52.9) | 109 (49.3) | 85 (51.8) |
Caucasians, No. (%) | 51 (100.0) | 221 (100.0) | 164 (100.0) |
Mean age ± SD, yrs | 3.16 ± 3.46 | 3.43 ± 3.79 | 3.39 ± 3.88 |
Age groups, No. (%) | |||
 <2 years | 5 (9.8) | 28 (12.7) | 15 (9.1) |
 2-5 years | 44 (86.3) | 182 (82.4) | 140 (85.4) |
 >5 years | 2 (3.9) | 11 (5.0) | 9 (5.5) |
Median number of siblings (range) | 1 (0–4) | 1 (0–3) | 1 (0–4) |
Exposure to passive smoking, No. (%) | 15 (29.4) | 69 (31.2) | 43 (26.2) |
Day care or school attendance, No. (%) | 49 (96.1) | 210 (95.0) | 158 (96.3) |
Previous pneumococcal vaccination, No. (%) | 46 (90.2) | 199 (90.0) | 143 (87.2) |
Previous pandemic A/H1N1/2009 influenza vaccination, No. (%) | 0 (0.0) | 3 (1.4) | 2 (1.2) |
Diagnosis, No. (%) | |||
 Common cold | 15 (29.4) | 78 (35.2) | NA |
 Pharyngitis | 14 (27.5) | 75 (33.9) | NA |
 Acute otitis media | 4 (7.8) | 21 (9.5) | NA |
 Pneumonia | 18 (35.4) | 47 (21.2) | NA |
 Minor surgical problem | NA | NA | 164 (100.0) |
Hospitalised at enrolment, No. (%) | 18 (35.4) | 47 (21.2) | NA |