Table 1 Demographic data among children who received postoperative oxygen therapy compared with those who did not

Age (years)

0.99

 <1

216 (18.8)

54 (18.8)

 1–6

552 (47.9)

138 (47.9)

 >6

384 (33.3)

96 (33.3)

Male

684 (59.4)

182 (63.2)

0.26

Weight, median (IQR) (kg)

16.0 (9.8-25.0)

14.3 (8.4-33.4)

0.41

Height, median (IQR) (cm)

104.0 (80-128.0)

98.5 (75.0-130.0)

0.19

Body mass index (kg/m²)

<0.001^*

 5–14.9

479 (41.6)

130 (45.1)

 15–24.9

629 (54.6)

128 (44.4)

 25-60

44 (3.8)

30 (10.4)

URI (Y/N)

72 (6.2)/1080 (93.8)

23 (8)/265 (92.0)

0.35

Pulmonary disease (Y/N)

8 (0.7)/1144 (99.3)

16 (5.6)/272 (94.4)

<0.001^*

Hyper-reactive airway (Y/N)

65 (5.6)/1087 (94.4)

24 (8.3)/264 (91.7)

0.12

Anemia (Y/N)

526 (45.7)/626 (54.3)

127 (44.1)/161 (55.9)

0.68

Snoring (Y/N)

14 (1.2)/1138 (98.8)

4 (1.4)/284 (98.6)

0.95

Non-cyanotic heart (Y/N)

41 (3.6)/1111 (96.4)

30 (10.4)/258 (89.6)

<0.001^*

Probable difficult airway (Y/N)

12 (1.0)/1140 (99.0)

21 (7.3)/267 (92.7)

<0.001^*

Risk of aspiration (Y/N)

24 (2.1)/1128 (97.9)

11 (3.8)/277 (96.2)

0.13

Delayed development (Y/N)

34 (3.0)/1118 (97.0)

22 (7.6)/266 (92.4)

<0.001^*