Table 1 Clinical characteristics of patients involved in the study
Among all cases (n = 1755) | |
 Age, y | 0.8(0.3, 2) |
  0–1 years(No, proportion) | 1280 (72.934%) |
  1–2 years (No, proportion) | 168 (9.573%) |
  2–3 years (No, proportion) | 129 (7.35%) |
  3–4 years (No, proportion) | 69 (3.932%) |
  4–5 years (No, proportion) | 60 (3.419%) |
  5–6 years (No, proportion) | 49 (2.792%) |
 Gender (M, proportion) | 936 (53.333%) |
 BMI, kg/m2 (mean, sd) | 15.003 ± 2.41 |
 RACHS | |
  1 | 73 (4.16%) |
  2 | 1268 (72.25%) |
  3 | 218 (12.422%) |
  4 | 175 (9.915%) |
  5 | 21 (1.2%) |
 PH (No, proportion) | 255(14.53%) |
 Down syndrome (No, proportion) | 24(1.368%) |
 Season of surgery (No, proportion) | |
  Winter (Dec-Mar) | 337 (19.202%) |
  Spring (Mar-Jun) | 505 (28.775%) |
  Summer (Jun-Sep) | 484 (27.578%) |
  Autumn (Sep-Dec) | 429 (24.444%) |
 Atmospheric pollutants | |
  AQI (daily average) | 116 (81,138) |
  PM2.5 (daily average) | 58 (39,89) |
  PM10 (daily average) | 118 (84,169) |
  SO2 (daily average) | 26 (15,46) |
  O3 (8-h average) | 98 (55,150) |
  Tmax (daily average) | 22 (10,30) |
  Tmin (daily average) | 10 (-1,19) |
  Humidity | 54 (39,68.75) |
 VAP (No, proportion) | 348 (19.829%) |
 Mortality (No, proportion) | |
  Hospital mortality | 57 (3.248%) |
  90 day-mortality | 68 (3.87%) |
  Ventilation (hours) | 24 (6, 70) |
  ICU stay (days) | 3.88 (2.0,6.67) |
  Postoperative hospital stay (days) | 9 (7, 13) |