Table 1 Demographic characteristics of children with MPP between the PB group and the non-PB group
Variables | Total | PB | non-PB | P value | |
|---|---|---|---|---|---|
Number | 1169 | 133 | 1036 | Â | |
Sex (male), No. (%) | 632 (54.06) | 71 (53.38) | 561 (54.15) | 1 | |
Age (mos), mean ± SD | 74.80 ± 30.64 | 80.40 ± 29.85 | 74.08 ± 30.68 | 0.3184 | |
|  | age ≤ 36 mos, No. (%) | 118 (10.09) | 9 (6.77) | 109 (10.52) | |
|  | 36 mos < age ≤ 60 mos, No. (%) | 267 (22.84) | 26 (19.55) | 241 (23.26) | |
|  | 60 mos < age ≤ 84 mos, No. (%) | 362 (30.97) | 44 (33.08) | 318 (30.69) | |
|  | 84 mos < age < 168 mos, No. (%) | 422 (36.10) | 54 (40.60) | 368 (35.52) | |
Etiological diagnostic methods, No. (%) | Â | ||||
| Â | Single elevated immunoglobulin M | 981 (83.92) | 119 (93.23) | 862 (83.20) | 0.0931 |
| Â | Seroconversion | 979 (83.75) | 120 (90.23) | 859 (82.92) | 0.0849 |
| Â | PCR in BAL | 1169 (100.00) | 133 (100.00) | 1036 (100.00) | 1 |
Incident season, No. (%) | Â | ||||
| Â | Spring (Mar, Apr, May) | 111 (9.55) | 18 (13.53) | 93 (8.98) | 0.4000 |
| Â | Summer (Jun, Jul, Aug) | 204 (17.45) | 23 (17.29) | 181 (17.47) | |
| Â | Fall (Sep, Oct, Nov) | 537 (45.94) | 60 (45.11) | 477 (46.04) | |
| Â | Winter (Dec, Jan, Feb) | 317 (27.12) | 32 (24.06) | 285 (27.51) | |
COVID-19 pandemic, No. (%) | Â | ||||
|  | Before | 509 (43.54) | 81 (60.90) | 428 (41.31) | < 0.0001* |
| Â | During | 660 (56.46) | 52 (39.10) | 608 (58.69) | |