Table 1.
Clinical and demographic characteristics of CPI patients and HCs
| Characteristic | CPI patientsMean (SD) | Healthy controlsMean (SD) | p‐values |
|---|---|---|---|
| Age, year | 43.1 (11.4) | 41.6 (11.5) | .625 |
| Education, year | 9.51 (2.93) | 10.45 (4.03) | .319 |
| Duration of insomnia, year | 10.84 (8.58) | n/a (n/a) | n/a |
| STAI‐s | 27.79 (4.23) | 25.96 (7.93) | .278 |
| STAI‐t | 31.93 (4.79) | 28.82 (9.83) | .132 |
| BDI‐II | 6.07 (5.14) | 5.03 (1.64) | .306 |
| PSQI | 13.4 (2.37) | 0.86 (1.05) | <.001 |
| Mean head motiona | 0.044 (0.024) | 0.045 (0.041) | .965 |
BDI, Beck Depression Inventory; CPI, chronic primary insomnia; n/a, not applicable; PSQI, Pittsburgh Sleep Quality Index; SD, standard deviation; STAI‐s, the State Trait State‐Anxiety Inventory; STAI‐t, the State Trait Trait‐Anxiety Inventory. The p value was obtained by an independent sample two‐tailed t‐test.
a
Head motion according to the criteria of Van Dijk. The same abbreviations apply for all figures and tables.