Table 1:
Baseline characteristics of the subset of the Sleep Heart Health Study population. Values are shown as mean ± SD, unless categorized by number and percentage. Abbreviations: SF-36 (36 item short form health survey), REM (rapid eye movement), WASO (wake after sleep onset), X probability (average matching probability of a state when the epoch is scored as that state). All parameters were included in random forest analysis.
| Parameter | Response | Number |
|---|---|---|
|
| ||
| Gender | Female | 1638 (52%) |
| Male | 1527 (48%) | |
|
| ||
| Race | White | 2694 (85%) |
| Black | 234 (7%) | |
| Other | 237 (7%) | |
|
| ||
| Ethnicity | Latinx | 176 (6%) |
|
| ||
| Age (years) | 62.7 ± 11.3 | |
|
| ||
| Marital status | Married | 2485 (79%) |
| Widowed | 257 (8%) | |
| Divorced/Separate | 313 (10%) | |
| Never Married | 98 (3%) | |
| Unknown | 12 (0%) | |
|
| ||
| Education level | <10 years | 241 (8%) |
| 11-15 years | 1622 (51%) | |
| 16-20 years | 1163 (37%) | |
| >20 years | 139 (4%) | |
|
| ||
| Waist circumference (cm) | 96.2 ± 13.6 | |
|
| ||
| Body Mass Index (BMI, kg/m2) | 27.9 ± 4.98 | |
|
| ||
| Physical Component Scale (PCS, SF-36) | 47.9 ± 9.58 | |
|
| ||
| Mental Component Scale (MCS, SF-36) | 53.3 ± 8.18 | |
|
| ||
| My health is excellent | Definitely true | 685 (22%) |
| Mostly true | 1620 (51%) | |
| Not sure | 394 (12%) | |
| Mostly false | 283 (9%) | |
| Definitely false | 183 (6%) | |
|
| ||
| During the past 4 weeks, how much of the time have you felt calm and peaceful? | All of the time | 267 (8%) |
| Most of the time | 1404 (44%) | |
| A good bit of the time | 620 (20%) | |
| Some of the time | 550 (17%) | |
| A little of the time | 238 (8%) | |
| None of the time | 86 (3%) | |
|
| ||
| Regular use of sleeping pills? | Yes | 192 (6%) |
|
| ||
| Regular use of antidepressants? | Yes | 218 (7%) |
|
| ||
| Use of benzodiazepines within 2 weeks of PSG? | Yes | 182 (6%) |
|
| ||
| Epworth Sleepiness Scale | 7.70 ± 4.34 | |
|
| ||
| Habitual sleep duration (hours) | 7.13 ± 1.15 | |
|
| ||
| How stressful a day today? | A typical day | 2122 (67%) |
| Less stressful than usual | 568 (18%) | |
| More stressful than usual | 475 (15%) | |
|
| ||
| Nicotine before bed (# products) | 0.359 ± 1.36 | |
|
| ||
| Alcohol before bed (# drinks) | 0.217 ± 0.689 | |
|
| ||
| Caffeine before bed (# drinks) | 0.280 ± 0.654 | |
|
| ||
| N1 (minutes) | 34.3 ± 22.5 | |
|
| ||
| N1 probability | 53.1% | |
|
| ||
| N1 (%) | 8.3% ± 5.2% | |
|
| ||
| N2 (minutes) | 227. ± 61.3 | |
|
| ||
| N2 probability | 84.0% | |
|
| ||
| N2 (%) | 55% ± 13% | |
|
| ||
| N3 (minutes) | 14.3 ± 21.9 | |
|
| ||
| N3 probability | 64.9% | |
|
| ||
| N3 (%) | 3.5% ± 5.4% | |
|
| ||
| REM (minutes) | 50.1 ± 36.3 | |
|
| ||
| REM probability | 75.4% | |
|
| ||
| REM (%) | 12% ± 8.5% | |
|
| ||
| WASO (minutes) | 86.8 ± 63.1 | |
|
| ||
| W probability | 84.1% | |
|
| ||
| WASO (%) | 21% ± 15% | |
|
| ||
| Sleep → Wake shifts (#) | 6.5 ± 3.1 | |
|
| ||
| N3 → N1 or N2 shifts (#) | 1.2 ± 1.4 | |
|
| ||
| Sleep latency (minutes) | 24.1 ± 23.2 | |
|
| ||
| Sleep efficiency (%) | 74.7 ± 15.4 | |
|
| ||
| Respiratory Disturbance Index | 8.26 ± 12.0 | |
|
| ||
| Self-reported sleep quality: Light (1) vs. Deep (5) | 1 | 272 (9%) |
| 2 | 572 (18%) | |
| 3 | 1290 (41%) | |
| 4 | 740 (23%) | |
| 5 | 291 (9%) | |
|
| ||
| Self-reported sleep quality: Restless (1) vs. Restful (5) | 1 | 361 (11%) |
| 2 | 727 (23%) | |
| 3 | 997 (32%) | |
| 4 | 749 (24%) | |
| 5 | 331 (10%) | |