Table 1. Baseline characteristics
Variable Overall, N = 1991 0, N = 1481 1, N = 511 p-value2
Postnatal_discovery


<0.001
    0 158 (79%) 129 (87%) 29 (57%)
    1 41 (21%) 19 (13%) 22 (43%)
Preoperative_infection_symptom


<0.001
    0 135 (68%) 113 (76%) 22 (43%)
    1 64 (32%) 35 (24%) 29 (57%)
Sex


0.5
    0 109 (55%) 79 (53%) 30 (59%)
    1 90 (45%) 69 (47%) 21 (41%)
Age 8 (6, 24) 9 (6, 21) 8 (6, 41) 0.6
WG(kg) 9.0 (7.5, 12.0) 9.0 (7.8, 11.6) 9.5 (7.5, 13.2) 0.4
Pathology(I/II/IV)


0.2
    1 59 (30%) 43 (29%) 16 (31%)
    2 135 (68%) 103 (70%) 32 (63%)
    4 5 (2.5%) 2 (1.4%) 3 (5.9%)
Lung_side_of_CPAM


0.079
    0 77 (39%) 52 (35%) 25 (49%)
    1 122 (61%) 96 (65%) 26 (51%)
Number_of_CPAM_lobes


0.051
    0 185 (93%) 141 (95%) 44 (86%)
    1 14 (7.0%) 7 (4.7%) 7 (14%)
Location_of_CPAM_lobes


0.095
    0 41 (21%) 32 (22%) 9 (18%)
    0/1 12 (6.0%) 6 (4.1%) 6 (12%)
    0/2 2 (1.0%) 1 (0.7%) 1 (2.0%)
    1 138 (69%) 106 (72%) 32 (63%)
    2 6 (3.0%) 3 (2.0%) 3 (5.9%)
Operative_route(thoracoscopic)


0.039
    0 6 (3.0%) 2 (1.4%) 4 (7.8%)
    1 193 (97%) 146 (99%) 47 (92%)
Operative_approach


0.13
    0 61 (31%) 41 (28%) 20 (39%)
    1 98 (49%) 73 (49%) 25 (49%)
    2 40 (20%) 34 (23%) 6 (12%)
Operation_duration(min) 110 (80, 150) 105 (80, 130) 120 (90, 165) 0.007
Intraoperative_blood_loss 10 (10, 30) 10 (5, 20) 20 (10, 55) <0.001
Postoperative_hospital_stay 6.00 (5.00, 7.00) 6.00 (5.00, 7.00) 7.00 (6.00, 8.00) <0.001
Chest_tube_duration 4.00 (3.00, 5.00) 4.00 (3.00, 5.00) 5.00 (4.00, 6.00) 0.004
Blood_transfusion


0.003
    0 151 (76%) 120 (81%) 31 (61%)
    1 48 (24%) 28 (19%) 20 (39%)
Postoperative_WBC_elevation


<0.001
    0 153 (77%) 124 (84%) 29 (57%)
    1 46 (23%) 24 (16%) 22 (43%)
1 n (%); Median (IQR)
2 Pearson’s Chi-squared test; Wilcoxon rank sum test; Fisher’s exact test