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The findings indicated that the children with AH1 \u22652\u00b75 and \u22653 showed significantly larger numbers of waking (<jats:italic>p<\/jats:italic>\u2003&lt;\u20030\u00b7005) and desaturation index (<jats:italic>p<\/jats:italic>\u2003&lt;\u20030\u00b701) than those with AHI &lt;2\u00b73 and &lt;3, respectively. Significantly (<jats:italic>p<\/jats:italic>\u2003&lt;\u20030\u00b705) higher amounts of waking and lower amounts of REM as a percentage of total sleep time (TST) were also found in the children with AH1 \u22653. In the subgroups with AHI \u22653\u00b75 and \u22654, only the percentage of REM was found to be significantly (<jats:italic>p<\/jats:italic>\u2003&lt;\u20030\u00b705) lower. No significant differences were found at the AHI threshold of 4\u00b75 and 4. AHI correlated significantly (<jats:italic>p<\/jats:italic>\u2003&lt;\u20030\u00b705) with the number of awakenings, amount of waking as a percentage of TST, desaturation index and oxygen saturation nadir. Higher incidence of skeletal Class II pattern was found in children with AHI \u22652\u00b75 and \u22653, and Class III in those with AHI &lt;2\u00b73 and &lt;3, respectively. The effects on polysomnographic characteristics demonstrated to be the greatest on children at the AHI threshold of 3. In addition, the evaluation of oxygen saturation can be used to provide some information concerning the severity of sleep\u2010related breathing disorders.<\/jats:p>","DOI":"10.1111\/j.1365-2842.2006.01676.x","type":"journal-article","created":{"date-parts":[[2007,1,19]],"date-time":"2007-01-19T19:50:40Z","timestamp":1169236240000},"page":"112-120","source":"Crossref","is-referenced-by-count":8,"title":["Sleep architecture and the apnoea\u2013hypopnoea index in children with obstructive\u2010sleep apnoea 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