Baseline characteristics of the study population
| Total (n = 3376) | Men (n = 1525) | Women (n = 1851) | |
|---|---|---|---|
| Mean age, y | 60.3 ± 8.7 | 60.4 ± 8.7 | 60.1 ± 8.7 |
| Chronic pain, no. (%) | 1191 (35.3) | 414 (27.1) | 777 (42.0) |
| Mean intracranial volume, mL | 1126 ± 119 | 1203 ± 102 | 1062 ± 91 |
| Positive CESD, no. (%) | 328 (8.5) | 81 (4.6) | 247 (11.7) |
| Mean heat pain threshold, °C (n = 1538) | 47.2 ± 3.2 | 48.0 ± 2.7 | 46.6 ± 3.4 |
Note:—CESD indicates Center for Epidemiologic Studies Depression scale.