Table 1.
Comparison of participants with and without insomnia symptoms (DIMS) on demographic, clinical, and sleep variables
| Demographic Variables | Overall Sample (n = 173) | No DIMS (n = 84) M (SD)/N (%) | DIMS (n = 89) M (SD)/N (%) |
|---|---|---|---|
| Age (Years) | 60.3 (16.1) | 61.1 (16.6) | 59.6 (15.8) |
| Gender | |||
| Male | 113 (65.3%) | 60 (53.1%) | 53 (46.9%) |
| Female | 60 (34.7%) | 24 (40.0%) | 36 (60.0%) |
| Race | |||
| White | 110 (63.6%) | 57 (51.8%) | 53 (48.2%) |
| Minority | 61 (46.8%) | 26 (42.6%) | 35 (57.4%) |
| Clinical Variables | |||
| Left ventricular ejection fraction (%) | 32.6 (15.2) | 32.9 (15.6) | 32.4 (14.9) |
| NYHA classification | 2.5 (0.7) | 2.4 (0.6) | 2.5 (0.7) |
| Body mass index | 30.7 (8.0) | 30.6 (8.7) | 30.8 (7.4) |
| Charlson Comorbidity Index | 2.4 (1.5) | 2.3 (1.6) | 2.6 (1.5) |
| Clinical depression | 30 (17.3) | 11 (13.1) | 19 (21.3) |
| Self-Reported Sleep Characteristics | |||
| Time in bed (min) | 487.2 (99.6) | 494.2 (83.6) | 480.6 (112.8) |
| Sleep latency (min)*** | 29.2 (30.5) | 16.1 (12.1) | 41.6 (36.8) |
| Sleep duration (min)*** | 387.1 (100.5) | 428.0 (86.0) | 348.5 (98.2) |
| Sleep efficiency*** | 80.0 (17.7) | 86.6 (14.5) | 73.8 (18.3) |
| Polysomnographic Sleep Characteristics | |||
| Sleep duration (min)** | 323.7 (96.6) | 343.5 (85.2) | 304.9 (103.3) |
| Time in bed (min) ** | 423.5 (98.8) | 444.6 (84.4) | 403.7 (107.4) |
| Sleep efficiency* | 71.0 (16.3) | 73.7 (13.7) | 68.5 (18.1) |
| Sleep latency (min) | 30.2 (35.3) | 26.3 (37.2) | 33.8 (33.2) |
| Respiratory disturbance index (RDI) | 24.3 (19.0) | 26.5 (20.4) | 22.2 (17.4) |
| RDI ≥ 15 | 103 (60.1%) | 53 (63%) | 50 (48.1) |
| Percent time at oxygen saturation < 90% | 11.9 (18.8) | 13.0 (19.9) | 10.8 (17.9) |
| Predominant obstructive sleep apnea | 38 (22.6) | 21 (25.0) | 17 (20.2) |
| Predominant central sleep apnea | 16 (9.5) | 8 (9.5) | 8 (9.5) |
| EEG arousal index | 21.36 (10.49) | 22.26 (11.21) | 20.49 (9.74) |
| Periodic limb movement index > 5 | 42 (24.7) | 22 (26.2) | 20 (23.3) |
***
P < 0.001,
**
P < 0.01,
*
P < 0.05