Characteristics of the children according to prophylaxis
| No RSV prophylaxis (n = 2370) | RSV prophylaxis (n = 376) | p | |||
|---|---|---|---|---|---|
| *For each variable, the number of missing data is n – total no. | |||||
| Inborn*, no./total no. (%) | 1668/2366 | (70.5) | 273/376 | (72.6) | 0.40 |
| Male gender*, no./total no. (%) | 1297/2370 | (54.7) | 213/376 | (56.7) | 0.48 |
| Single pregnancy*, no./total no. (%) | 1615/2370 | (68.1) | 269/373 | (72.1) | 0.12 |
| Gestational age*, total no. | 2366 | 376 | <0.0001 | ||
| 23–30 wk, no. (%) | 1125 | (47.5) | 328 | (87.2) | |
| 31–32 wk, no. (%) | 1241 | (52.5) | 48 | (12.8) | |
| Gestational age (wk), median (range) | 31 | (23–32) | 28 | (24–32) | <0.0001 |
| Birth weight*, total no. | 2370 | 376 | <0.0001 | ||
| <1000 g, no. (%) | 364 | (15.4) | 191 | (50.8) | |
| 1000–1500 g, no. (%) | 1053 | (44.4) | 146 | (38.8) | |
| >1500 g, no. (%) | 953 | (40.2) | 39 | (10.4) | |
| Birth weight (g), mean (SD) | 1417 | (383) | 1071 | (326) | <0.0001 |
| Intrauterine growth restriction*, no./total no. (%) | 184/2366 | (7.8) | 39/376 | (10.4) | 0.09 |
| Supplemental O2 at 28 days*, no./total no. (%) | 360/2359 | (15.3) | 280/375 | (74.7) | <0.0001 |
| Supplemental O2 at 36 weeks*, no./total no. (%) | 97/2353 | (4.1) | 154/371 | (41.5) | <0.0001 |
| Date of discharge*, total no. | 2370 | 376 | <0.0001 | ||
| Before October 2000, no. (%) | 1104 | (46.6) | 139 | (37.0) | |
| October–December 2000, no. (%) | 775 | (32.7) | 176 | (46.8) | |
| After December 2000, no. (%) | 491 | (20.7) | 61 | (16.2) | |
| Age at the onset of exposure (wk), median (range) | 9.1 | (0.1–38.1) | 13.3 | (0.3–31.0) | <0.0001 |
| At least once hospitalised for any cause, no. (%) | 650 | (27.4) | 164 | (43.6) | <0.0001 |
| At least once hospitalised for LRI, no. (%) | 356 | (15.0) | 106 | (28.2) | <0.0001 |
| At least once hospitalised for RSV related infection, no. (%) | 170 | (7.2) | 23 | (6.1) | 0.46 |
| At least once hospitalised for RSV negative LRI, no. (%) | 138 | (5.8) | 80 | (21.3) | <0.0001 |