Table 1.
Characteristics of Included vs. Excluded Sleep Heart Health Study Data
| Measure | Included Data | Excluded Data | P |
|---|---|---|---|
| Age (years) | 62.2 ± 10.9 | 60 ± 9.9 | < 0.001 |
| Sex (M/F) | 51.6 / 49.4 | 48 / 52 | 0.4* |
| Epworth Sleepiness Scale score | 7.8 ± 4.4 | 7.5 ± 4.5 | 0.06 |
| Body mass index | 28.7 ± 5.3 | 29.4 ± 6.1 | < 0.001 |
| Total sleep time (TST) | 354.9 ± 63.4 | 350.1 ± 68.6 | 0.05 |
| Sleep efficiency | 81.5 ± 10.6 | 79.9 ± 11.9 | 0.001 |
| Stage 1 NREM (% TST) | 5.6 ± 4.1 | 5.9 ± 4.6 | 0.03 |
| Stage 2 NEEM (% TST) | 57.2 ± 11.7 | 59.7 ± 11.9 | < 0.001 |
| Stage 3+4 NREM (% TST) | 17.4 ± 11.8 | 15 ± 11.6 | < 0.001 |
| Stage REM | 19.8 ± 6.3 | 19.4 ± 6.5 | 0.06 |
| Arousal index (/h of sleep) | 19.2 ± 10.5 | 19.6 ± 10.6 | 0.2 |
| Apnea-hypopnea index (/h of sleep) | 9.1 ± 12.7 | 9.4 ± 12.4 | 0.5 |
| Respiratory disturbance index (/h of sleep) | 33.7 ± 19.7 | 34.3 ± 20 | 0.3 |
| Central apnea index (/h of sleep) | 0.5 ± 2.2 | 0.5 ± 2.3 | 0.8 |
| Periodic breathing (+/−) | 2.5 / 97.5 | 2.8 / 97.2 | 0.5* |
| Diabetes (+/−) | 10.6 / 89.6 | 23.8 / 76.2 | < 0.001* |
| Hypertension medication use (+/−) | 39.1 / 60.9 | 38.6 / 61.4 | 0.8* |
| Myocardial infarction (+/−) | 7 / 93 | 9.7 / 90.3 | 0.001* |
| Angina (+/−) | 7.6 / 92.4 | 8.5 / 91.5 | 0.07* |
| CABG (+/−) | 3.4 / 96.6 | 3.2 / 96.8 | 0.1* |
| Pacemaker (+/−) | 0.8 / 99.2 | 0.7 / 99.3 | 0.09* |
| Stroke (+/−) | 3.5 / 96.5 | 4.3 / 95.7 | 0.3* |
| Heart failure (+/−) | 1.8 / 98.2 | 3.1 / 96.9 | < 0.001 |
*
= χ2; +/ − = proportions present/ absent. Race differences were prominent. The % of polysomnograms (included vs. excluded categories) for Caucasian, African American, Native American /Alaskan, Asian/ Pacific Islander, and Hispanic / Mexican American were 75.5% vs. 46.1%, 8.3% vs. 1.7%, 9.7% vs. 49.6%, 1.5 vs. 0.7 and 5% vs. 1.6%, respectively. Nearly half of the excluded studies were Native-American /Alaskan, χ2, 1000, P < 0.001.