Demographic parameters and comorbidities
| Variables, n (%) | Group C (with PRAEs, n=46) | Group NC (without PRAEs, n=170) | P value |
| Age (years)* | 3.5±1.4 | 3.5±1.5 | 0.987 |
| Age <2 years | 9 (19.5) | 37 (21.7) | 0.070 |
| Weight (kg)* | 17.7±6.3 | 16.7±4.0 | 0.060 |
| Weight <10 kg | 6 (13.0) | 10 (5.8) | 0.096 |
| Sex (male/female) | 27/19 | 100/71 | 0.856 |
| With comorbidities (ASA status >1) | 28 (60.8) | 22 (12.9) | <0.001 |
| Respiratory cormorbidities | 14 (30.4) | 3 (1.7) | <0.001 |
| Obesity† | 21 (45.6) | 14 (8.2) | <0.001 |
| Past anesthesia-related complications | 1 (2.1) | 1 (0.5) | 0.381 |
| Passive smoking | 33 (71) | 24 (14.1) | <0.001 |
| Upper respiratory tract infection <15 days | 23 (50) | 42 (24.7) | 0.001 |
| Patients postponed before 15 days | 18 (39.1) | 13 (7.6) | <0.001 |
*Data are presented with mean±SD.
†Obesity is defined as BMI ≥ 95th percentile for children of the same age and sex.
ASA, American Society of Anesthesiologists; C, complicated; NC, non-complicated; PRAE, perioperative respiratory adverse event.