Table 3

Polysomnographic data in the video education and the usual care group

Polysomnographic variablesVideo education
(n=99)
Usual care
(n=113)
Pretreatment AHI42 (37 to 47)50 (45 to 56)
Pretreatment 3% ODI33 (29 to 38)42 (36 to 48)
Pretreatment 4% ODI20 (16 to 24)28 (23 to 33)
Pretreatment T90, min13 (9 to 18)17 (13 to 22)
Pretreatment SpO2 nadir, %82 (80 to 83)80 (79 to 82)
Pretreatment arousal index37.8 (33.1 to 42.4)42.2 (36.5 to 48.0)
Arousal index during CPAP titration16.7 (14.4 to 19.1)16.4 (14.5 to 18.2)
Pretreatment sleep efficiency, %77 (73 to 80)74 (71 to 77)
Sleep efficiency during CPAP titration, %83 (80 to 85)83 (81 to 86)
Mask type
Nasal mask, n (%)58 (58.6)66 (58.4)
Nasal pillows, n (%)18 (18.2)21 (18.6)
Oronasal mask, n (%)23 (23.2)26 (23.0)
Auto-PAP minimum pressure, cm H2O7.4 (7.0 to 7.9)7.7 (7.3 to 8.1)
Auto-PAP maximum pressure, cm H2O13.0 (12.4 to 13.6)13.6 (13.1 to 14.0)
  • Data reported as mean (95% CI) or percentages.

  • AHI, Apnoea–Hypopnoea Index; Auto-PAP, auto-adjustable positive airway pressure; ODI, Oxygen Desaturation Index; T90, duration of sleep in minutes below 90% oxygen saturation.