Table 5. Comparison of the clinical characteristics of the 49-pertussis positive patients with or without respiratory support.
| Clinical feature | Need of oxygen | Statistics | P value | |
|---|---|---|---|---|
| No (N=36), (%) | Yes (N=13), (%) | |||
| Age <3 months | 18 (50.0) | 9 (69.2) | 1.428a | 0.333 |
| Uncompleted immunization | 30 (83.3) | 12 (92.3) | 0.628a | 0.658 |
| Unvaccinated | 18 (50.0) | 11 (84.6) | 4.738a | 0.047 |
| Premature | 0 | 4 (30.8) | 12.062a | 0.003 |
| Mixed virus infection | 26 (72.2) | 9 (69.2) | 0.042a | 1.000 |
| Fever | 6 (16.7) | 5 (38.5) | 2.606 | 0.106 |
| Wheeze | 15 (41.7) | 6 (46.2) | 0.079 | 0.779 |
| Inspiratory whoop | 7 (19.4) | 0 | 2.949a | 0.167 |
| Cyanosis | 10 (27.8) | 5 (38.5) | 0.513 | 0.474 |
| Apnea | 0 | 3 (23.1) | 8.849a | 0.016 |
| CHD | 3 (8.3) | 4 (30.8) | 3.926a | 0.070 |
| Complications | 9 (25.0) | 5 (38.5) | 0.848 | 0.357 |
| Contact history | 12 (33.3) | 7 (53.8) | 1.693a | 0.193 |
| SMZ-TMP | 4 (11.1) | 3 (23.1) | 1.117a | 0.363 |
| Time of hospitalization (d) | 6 (5, 10)b | 14 (8, 17)b | −3.084b | 0.002 |
| WBC (×109/L) | 17.49 (12.98, 22.42)b | 19.76 (13.65, 24.47)b | −0.906b | 0.365 |
| LY% | 70.15 (62.95, 75.25)b | 64.50 (48.2, 71.45) b | −2.106b | 0.035 |
a, Fisher’s exact test; b, data lacking a normal distribution are expressed as the median and quartiles, i.e., median (25%, 75%), and the statistic is Z value. BP, B. pertussis; CHD, congenital heart disease; LY, lymphocyte; RSV, respiratory syncytial virus; SMZ, sulfamethoxazole; TMP, trimethoprim; WBC, white blood cell.