Table 3– Sleep study results on patients investigated by polysomnography (PSG)
FemaleMaleTotal
AHI events·h−122.3±25.0 (365)31.7±26.3 (978)29.1±26.3 (1343)
Sleep apnoea
 None, AHI <526.012.215.9
 Mild, AHI 5–1528.221.123.9
 Moderate, AHI >15–3020.923.122.4
 Severe, AHI >3024.942.637.8
ODI events·h−117.6±23.5 (426)23.5±24.8 (1141)21.9±24.6 (1567)
Mean Sa,O2 %93.6±3.7 (428)93.1±4.6 (1154)93.2±4.4 (1582)
Lowest Sa,O2 %83.7±10.2 (428)81.2±11.1 (1149)81.9±11.3 (1577)
Total sleep time by PSG min385.1±82.7 (428)384.9±81.3 (1151)385.0±81.6 (1579)
Subjective sleep time by questionnaire min402.6±91.5 (230)396.6±91.4 (690)398.1±91.4 (920)
  • Data are presented as mean±sd (n) or %. AHI: apnoea/hypopnoea index; ODI: oxygen desaturation index; Sa,O2: arterial oxygen saturation.