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. 2012 May 1;185(9):998–1003. doi: 10.1164/rccm.201112-2167OC

TABLE 2.

POLYSOMNOGRAPHIC DATA (N = 51)

Baseline On PAP P Value
Sleep efficiency, % total sleep time 82 ± 11 83 ± 18 0.81
Arousal index, N/hr 23 ± 15 16 ± 18 0.019
Stage N1, % TST 8.8 ± 5.9 6.1 ± 6.7 <0.001
Stage N2, % TST 49.1 ± 9.9 46.7 ± 11.2 0.16
Stage N3, % TST 22.3 ± 8.8 24.6 ± 13.5 0.18
Rapid eye movement sleep, % TST 19.7 ± 6.9 22.5 ± 7.5 0.036
Apnea hypopnea index, N/hr 18.1 ± 14.7 2 ± 2.3 <0.001
SpO2 nadir, % 80 + 13 90 ± 4 <0.001
Time with SpO2 <90%, % TST 4.9 ± 9.1 0.1 ± 0.5 0.001
Peak end-tidal CO2, mm Hg 57 ± 5 55 ± 5 0.027
Time with end-tidal Pco2 >50 mm Hg, % TST 16.7 ± 22.4 12 ± 19.6 0.42

Definition of abbreviations: PAP = positive airway pressure; SpO2 = oxygen saturation as measured by pulse oximetry; TST = total sleep time.

Data are shown as mean ± SD. Significant P values shown in bold.