Table 1 Demographic data of the three groups of study subjects
| No LRTI(n = 32) | RSV– LRTI(n = 50) | RSV+ LRTI(n = 44) | p values
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| No LRTI vs RSV– | No LRTI vs RSV+ | RVS– vs RSV+ | ||||
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| Antenatal infection (n) | 16 (50%) | 13 (26%) | 9 (20%) | 0.06 | 0.02 | 1.00 |
| Maternal smoking in pregnancy (n) | 1 (3%) | 6 (12%) | 11 (25%) | 0.34 | <0.01 | 0.18 |
| Antenatal steroids (n) | 25 (78%) | 43 (86%) | 40 (91%) | 0.97 | 0.36 | 1.00 |
| Boys (n) | 17 (53%) | 27 (54%) | 31 (70%) | 1.00 | 0.39 | 0.32 |
| Gestational age (weeks) | 29.5 (23–31) | 28 (24–31) | 29 (23–31) | 1.00 | 1.00 | 1.00 |
| Birth weight (g) | 1175 (500–1850) | 1040 (650–2280) | 1010 (570–1960) | 1.00 | 1.00 | 1.00 |
| Surfactant (n) | 26 (81%) | 37 (74%) | 31 (70%) | 1.00 | 1.00 | 1.00 |
| Postnatal infection (n) | 19 (59%) | 23 (46%) | 25 (57%) | 0.72 | 1.00 | 0.89 |
| Ventilator days (n) | 6 (0–63) | 3.5 (0–79) | 4.5 (0–116) | 0.97 | 1.00 | 0.47 |
| Bronchopulmonary dysplasia (n) | 13 (41%) | 21 (43%) | 17 (39%) | 1.00 | 1.00 | 1.00 |
| Duration of oxygen therapy (weeks) | 33.5 (32–60) | 35 (31–92) | 32.5 (30–107) | 1.00 | 1.00 | 1.00 |
| Discharge August–November (n) | 12 (38%) | 20 (40%) | 23 (52%) | 1.00 | 0.61 | 0.70 |
| Family history of atopy (n) | 13 (41%) | 22 (44%) | 25 (57%) | 1.00 | 0.50 | 0.65 |
| No of school aged siblings (n) | 0.5 (0–3) | 0.5 (0–4) | 1 (0–4) | 1.00 | 0.51 | 0.23 |
| Day care attendance (n) | 4 (13%) | 6 (12%) | 9 (20%) | 1.00 | 1.00 | 0.77 |
| Parental smoking in the home (n) | 5 (16%) | 10 (20%) | 13 (30%) | 1.00 | 0.46 | 0.81 |
| Breast feeding (n) | 21 (66%) | 33 (66%) | 29 (66%) | 1.00 | 1.00 | 1.00 |
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| Data are shown as n (%) or median (range). | ||||||