Clinical characteristics and PSG findings in the 50 children studied.

Normally distributed data are expressed as Mean ± SD; AHI expressed as/hour total sleep time.Data that are not normally distributed are expressed as Median (interquartile range).正态分布数据以均数±标准差（Standard Deviation，SD）表示；呼吸暂停低通气指数（Apnea-Hypopnea Index，AHI）以每小时总睡眠时间为单位表述。非正态分布数据以中位数（四分位数间距）表示。