Table 2

Comparisons of partners' polysomnographic sleep quality, simple reaction time, and feeling refreshed in the morning after monitoring on each intervention limb in the crossover trial

Study night and morning results CPAP limb (n=22) Placebo limb (n=22) p value
Mean (SD) total recording time (min)489  (45)489  (45)1
Mean (SD) sleep latency (min)2-150 26.3 (13)32.6 (15)0.3
Mean (SD) SEI (%)2-160 78 (11)77 (11)0.8
Mean (SD) arousal index (events/h)24 (11)25 (12)0.4
Mean (SD) time in stage 3+4 (min)43 (24)43 (26)0.9
Mean (SD) time in stage REM (min)83 (28)90 (25)0.9
Median (IQR) SURT response time (s)0.33 (0.28–0.39)0.36 (0.33–0.38)0.4
Mean (SD) reciprocal SURT response time (1/s)2.9 (0.5)2.9 (0.4)0.12-151
Median (IQR) 95th percentile SURT response time (s)0.47 (0.44–0.6)0.50 (0.44–0.58)0.5
Median (IQR) refreshed in morning2-164 3 (2.5–4)3 (2–4)0.4
  • SEI = sleep efficiency index; SURT = simple unprepared reaction time.

  • 2-150 Sleep latency data were compared during the first limb of the study only because of a treatment × order effect.

  • 2-160 SEI is calculated as total sleep time/total recording time.

  • 2-151 There was a weak trend favouring better (quicker) partner mean reciprocal reaction times on the CPAP limb.

  • 2-164 Maximally refreshed = 5, maximally unrefreshed = 1.