Sleep quality (using a 5-grade scale) | ||||
Low sleep quality (1–3) | High sleep quality (4–5) | |||
Cases | Controls | Cases | Controls | |
N | 350 | 375 | 1725 | 2789 |
Women, n (%) | 240 (69) | 273 (73) | 1262 (73) | 2051 (74) |
Swedish, n (%) | 267 (76) | 274 (73) | 1373 (80) | 2205 (79) |
Phase shift, mean no. of hours (SD) | 1.3 (1.4) | 1.4 (1.3) | 1.3 (1.1) | 1.3 (1.1) |
Sleep duration, hours/night (SD) | 7.4 (1.4) | 7.4 (1.4) | 8.2 (0.9) | 8.2 (0.9) |
Smoking, n (%) | 198 (56) | 172 (46) | 1725 (50) | 1149 (41) |
Mean sun exposure (SD) | 5.9 (1.9) | 6.6 (1.9) | 6.3 (1.7) | 6.5 (1.8) |
Mean adolescent BMI, kg/m (SD) | 23.0 (4.4) | 22.6 (4.0) | 22.5 (3.8) | 21.8 (3.3) |
Infectious mononucleosis, n (%) | 70 (20) | 42 (11) | 311 (18) | 295 (11) |
Age at disease onset (SD) | 32.1 (10.8) | 35.3 (10.6) |
BMI, body mass index.