Table 1.
Characteristics of cases hospitalised for RSV-bronchiolitis and controlsa
| Variable | Cases (N = 1227) | Controls (N = 554) | P valueb |
|---|---|---|---|
| Number (%) | Number (%) | ||
| Sex | 0.01 | ||
| Male | 705 (57.5) | 282 (50.9) | |
| Female | 522 (42.5) | 272 (49.1) | |
| Population group | <0.001 | ||
| Arabs | 552 (45.0) | 196 (35.4) | |
| Jews | 675 (55.0) | 358 (64.6) | |
| Age, months | |||
| 0–5 | 786 (64.1) | 195 (35.4) | <0.001 |
| 6–11 | 297 (24.2) | 94 (17.0) | |
| 12–23 | 144 (11.7) | 263 (47.6) | |
| Socio-economic status of place of residence | <0.001 | ||
| Low (1–4) | 614 (50.2) | 220 (40.3) | |
| High (5–10) | 609 (49.8) | 326 (59.7) | |
| Calendar month of birth | <0.001 | ||
| October–January | 648 (52.8) | 180 (32.5) | |
| February–May | 226 (18.4) | 196 (35.4) | |
| June–September | 353 (28.8) | 178 (32.1) | |
| Median weight at birth (grams) (min-max) | 3145 (700–5505) | 3175 (660–4800) | 0.2 |
| Missing | 267 | 245 | |
| Gestational age at birth (weeks) | 0.6 | ||
| ≤36 | 128 (13.9) | 20 (15.6) | |
| >37 | 793 (86.1) | 108 (84.4) | |
| Congenital malformations | <0.001 | ||
| No | 1188 (96.8) | 272 (100.0) | |
| Yes | 39 (3.2) | 0 (0.0) | |
| Chronic medical conditions | 0.01 | ||
| No | 1109 (90.4) | 521 (94.0) | |
| Yes | 118 (9.6) | 33 (6.0) | |
| Hospitalisation in the last month | 0.005 | ||
| No | 1155 (94.4) | 480 (97.6) | |
| Yes | 69 (5.6) | 12 (2.4) | |
| Past hospitalisations | 0.07 | ||
| No | 1050 (85.8) | 413 (82.3) | |
| Yes | 174 (14.2) | 89 (17.7) | |
| Emergency room visit in the last month | 0.3 | ||
| No | 1154 (94.2) | 473 (95.6) | |
| Yes | 71 (5.8) | 22 (4.4) | |
| History of stay in neonatal intensive care | 0.006 | ||
| No | 881 (92.2) | 455 (96.0) | |
| Yes | 75 (7.8) | 19 (4.0) | |
aRSV, respiratory syncytial virus.
bP value obtained by the χ2 test or Fisher exact test where appropriate.