Table 2.
Polysomnographic features of men and women
| Men (N = 954) | Women (N = 1103) | P | |
|---|---|---|---|
| Total sleep time (TST)a, min | 340.5 ± 79.53 | 376.50 ± 81.59 | <0.0001 |
| Sleep efficiencya, % | 73.51 ± 13.90 | 77.66 ± 12.76 | <0.0001 |
| REM latencya, min | 102.1 ± 74.31 | 114.7±77.39 | 0.0002 |
| N1a, %TST | 17.16 ± 10.47 | 12.00 ± 7.15 | <0.0001 |
| N2a, %TST | 58.69 ± 10.36 | 56.59±10.08 | <0.0001 |
| N3a, %TST | 7.08 ± 7.45 | 12.58 ± 9.46 | <0.0001 |
| REMa, %TST | 17.08 ± 6.60 | 18.82 ± 6.67 | <0.0001 |
| Arousal Index (AI)a, events/h | 25.42 ± 13.22 | 19.65 ± 10.24 | <0.0001 |
| AI-REMa, events/h | 19.76 ± 12.25 | 15.95 ± 11.04 | <0.0001 |
| AI-NREMa, events/h | 26.40 ± 14.13 | 20.39 ± 10.98 | <0.0001 |
| AHI4Pa, events/h | 17.57 ± 18.03 | 10.43 ± 13.47 | <0.0001 |
| REM-AHI4Pa, events/h | 24.14 ± 21.68 | 22.72 ± 22.53 | 0.15 |
| NREM-AHI4Pa, events/h | 16.75 ± 18.52 | 8.20 ± 13.02 | <0.0001 |
| AHI4P ≥ 15, n (%) | 392 (41.1%) | 240 (21.8%) | <0.0001 |
| REM-AHI4P ≥ 15, n (%) | 499 (57.4%) | 539 (56.6%) | 0.7504 |
| NREM-AHI4P ≥ 15, n (%) | 346 (37.8%) | 171 (17.1%) | <0.0001 |
| mAHI4Pa | 19.12 ± 18.76 | 11.12 ± 13.65 | <0.0001 |
| Overall ratio of obstructive apneas to hypopneasa | 0.70 ± 6.29 | 0.32 ± 2.29 | 0.08 |
| NREM ratio of obstructive apneas to hypopneasa | 0.75 ± 5.64 | 0.28 ± 2.24 | 0.0165 |
| REM ratio of obstructive apneas to hypopneasa | 0.54 ± 1.95 | 0.42 ± 1.71 | 0.1633 |
TST = total sleep time; AI = arousal index; AHI4P = apnea hypopnea index, all apneas and hypopneas, each associated with more than 4% desaturation; mAHI4P = medicare AHI, defined as all apneas (regardless of desaturation) plus hypopneas associated with more than 4% desaturation; ratio of obstructive apneas to hypopneas = all obstructive apneas divided by hypopneas with at least 3% desaturation.
aContinuous variables, mean ± SD, respectively.