Table 1.

Study patient and operative characteristics

Characteristic	Number	Percentage (%)
Overall	733	100
Age (years)
11–13	302	41.2
14–15	258	35.2
16–18	173	23.6
Female sex	598	81.6
BMI-for-age
< 5th percentile (underweight)	14	1.9
5th–85th percentile	495	67.5
85th–95th percentile (overweight)	96	13.1
≥ 95th percentile (obese)	128	17.5
History of asthma	41	5.6
Number of levels fused
1–6	39	5.3
7–12	542	73.9
≥ 13	152	20.7
Osteotomy performed	253	34.5
Operative time ≥ 365 minutes	108	14.7