Table 1.
Demographic information and self-report and polysomnographic sleep and task-switching variables for controls at baseline (T1) and the insomnia group at baseline (T1) and at Follow-up (T2). Standard deviation or percent of sample in parentheses. Switch cost units are proportion correct for accuracy and milliseconds for response time. Polysomnographic sleep variables are presented in minutes. Sleep latency complaint and WASO complaint reflect responses on a baseline survey of sleep. For T1 in the insomnia group, standard PSG variables n = 46; delta sleep ratio n = 45.
| Control T1 (n = 51) | Insomnia T1 (n = 48) | Insomnia T2 (n =38) | |
|---|---|---|---|
| Age | 67.26 (5.16) | 69.26 (7.87) | |
| N White/Caucasian | 49 (96.1%) | 42 (87.5%) | |
| N College Degree or greater | 38 (74.5%) | 36 (75%) | |
| N Female | 33 (64.7%) | 29 (60.4%) | |
| Number of medications | 4.63 (2.75) | 6.19 (3.76) | |
| Apnea-hypopnea index | 4.87 (5.43) | 6.23 (6.29) | |
| Sleep latency complaint | 1 (2%) | 34 (70.8%) | |
| WASO complaint | 1 (2%) | 36 (75%) | |
| Insomnia Severity Index | 0.69 (1.33) | 14.67 (4.56) | 5.68 (4.48) |
| Total Sleep Time (mins) | 375.21 (46.90) | 337.12 (59.82) | 339.21 (46.934) |
| Sleep Efficiency (%) | 83.48 (8.29) | 75.76 (11.19) | 83.54 (10.61) |
| Sleep Latency (mins) | 12.59 (11.75) | 13.95 (13.96) | 10.37 (6.70) |
| WASO (mins) | 62.28 (37.65) | 95.16 (49.93) | 57.42 (44.16) |
| N1% | 7.28 (4.57) | 8.50 (5.21) | 7.28 (4.27) |
| N2% | 58.83 (9.68) | 58.60 (10.00) | 58.73 (9.92) |
| N3% | 11.47 (9.10) | 9.78 (8.41) | 10.06 (9.27) |
| Absolute Delta Power (μV2/Hz) | 24.93 (11.44) | 22.95 (10.77) | 24.60 (13.52) |
| Absolute Delta Sleep Ratio NREM 1/NREM 2 | 1.30 (0.46) | 1.17 (0.41) | 1.08 (0.38) |