Table 1 Comparison of clinical features between the SMPP and NSMPP groups [n (%), \(\bar x \pm s\)]
|  | Index | Total | SMPP (n = 68) | NSMPP(n = 176) | Z/χ2 | P |
|---|---|---|---|---|---|---|
| Â | Sex, male | 132 (54.1) | 32 (47.06) | 100 (56.82) | 1.881 | 0.1701 |
| Â | Age, y | 5.25(1.75,7) | 0.875(0.2604,6.25) | 6(3.31,8) | 5.922 | 0.00 |
Clinical data | Fever, d | 7(3,10) | 3(1,7) | 9(6,13) | 7.129 | 0.00 |
| Â | Cough, d | 6(3,10.25 | 3(1.25,7) | 7(4,13) | 4.689 | 0.00 |
|  | Dyspnea, n | 47 (19.26) | 38 (55.88) | 9 (5.11) | 81.2905 | < 0.0001 |
| Â | Extrapulmonary complications, n | 123 (50.41) | 37 (54.41) | 86 (48.86) | 0.1312 | 0.717 |
| Â | Pleural effusion, n | 68 (27.87) | 8 (11.76) | 60 (34.09) | 12.162 | 0.0004 |
| Â | Prehospital history, d | 7(5,12.75 | 5(2,8.75) | 9(6,14) | 5.179 | 0.00 |
| Â | Hospitalization time, d | 13(10,17) | 14(10,26) | 12(10,15) | 3.071 | 0.002 |
| Â | APACHE II | 3(0,7.75) | 11(8,13.75) | 2(0,3) | 11.511 | 0.00 |
| Â | SOFA | 2(0,4) | 5(4,7) | 1(0,2) | 10.251 | 0.00 |
| Â | Times of BAL | 1(1,2) | 1.5(1,2) | 1(1,1) | 4.469 | 0.00 |
| Â | Plastic bronchitis, n | 54 (22.13) | 10 (14.71) | 44 (25) | 3.306 | 0.069 |
|  | RMPP, n | 105 (43.03) | 15 (22.06) | 90 (51.14) | 16.917 | < 0.0001 |
CT score | Total | 10(8,14) | 11(8,14) | 10(8,14) | 0.496 | 0.620 |
| Â | Right upper lobe | 2(0,4) | 3(1.25,4) | 1(0,4) | 0.496 | 0.620 |
| Â | Right middle lobe | 2(0,4) | 3(1,4) | 1(0,4) | 3.561 | 0.000 |
| Â | Right lower lobe | 2(1,4) | 2(1,4) | 2(0.25,4) | 2.818 | 0.005 |
| Â | Left upper lobe | 1(0,2) | 1(0,2) | 1(0,3) | 0.166 | 0.868 |
| Â | Left lower lobe | 2(0,4) | 2(0,3) | 2(0,5) | 0.321 | 0.748 |
BS | Total | 10(9,12) | 10(9,12) | 10(9,12)9 | 0.863 | 0.388 |
| Â | Secretion volume | 5(4,6) | 5(4,6) | 5(4,6) | 0.818 | 0.413 |
| Â | Secretion color | 3(2,3) | 3(2,3) | 3(2,3) | 0.500 | 0.617 |
| Â | Mucosal edema | 2(1,2) | 2(1,2) | 2(1,2) | 0.416 | 0.677 |
| Â | Mucosal eminence | 0(0,0) | 0(0,0.75) | 0(0,0) | 1.718 | 0.086 |
| Â | Mucosal erythema | 1(1,1) | 1(0,1) | 1(1,1) | 0.489 | 0.625 |
| Â | Mucosal pallor | 0(0,1) | 0(0,1) | 0(0,1) | 2.196 | 0.028 |
Laboratory index | MP-DNA, copies/ml | 128,000(1500,32900000) | 2365(551,16800) | 5,965,000(9655,70175) | 6.210 | 0.00 |
| Â | WBC, Ă—109/L | 9(6.51,12) | 9(6,13) | 9(7,12) | 0.055 | 0.956 |
| Â | CRP, mg/L | 21.15(4.8,49.1) | 14(4.25,59.25) | 23(5.25,45) | 0.213 | 0.831 |
| Â | PCT, ng/ml | 0.29(0.09,0.78) | 0(0,1) | 0(0,1) | 0.665 | 0.506 |
| Â | LDH, U/L | 627.5(400.75,883.5) | 730(543,1072) | 566(381.5,875) | 2.151 | 0.032 |
| Â | IL-6, mg/L | 25.54(10.87,82.7) | 26(12.25,0.91) | 28(10.25,75.5) | 0.783 | 0.434 |
| Â | DD | 2.1(1,5.3) | 2(1,5) | 2(1,5) | 0.114 | 0.909 |
|  | Immunoglobulin abnormality, n | 40 (16.39) | 23 (33.82) | 17 (9.66) | 20.5029 | < 0.0001 |
|  | Abnormal NK cell ratio, n | 42 (17.21) | 24 (35.29) | 18 (10.23) | 21.6277 | < 0.0001 |