Table 1 Baseline characteristics of study cohort (n = 1703)
|  | Overall N = 1703 (%) | Has sleep dysfunction n = 734 | Short sleep duration n = 280 | Poor sleep quality n = 342 |
|---|---|---|---|---|
Family support | ||||
 Mean (SD) | − 0.266 (1.08) | −0.367 (1.14) | − 0.469 (1.21) | −0.439 (1.17) |
 Missing | 247 (14.5%) | 104 (14.2%) | 39 (13.9%) | 54 (15.8%) |
 p-value |  | < 0.001 | 0.001 | 0.001 |
Friend Support | ||||
 Mean (SD) | −0.069 (0.977) | − 0.145 (1.05) | − 0.214 (1.05) | − 0.165 (1.02) |
 Missing | 241 (14.2%) | 103 (14.0%) | 39 (13.9%) | 54 (15.8%) |
 p-value |  | 0.02 | 0.003 | 0.035 |
Gender | ||||
 Man | 796 (46.7%) | 322 (43.9%) | 122 (43.6%) | 132 (38.6%) |
 Woman | 907 (53.3%) | 412 (56.1%) | 158 (56.4%) | 210 (61.4%) |
 Missing | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
 p-value |  | 0.02 | 0.208 | < 0.001 |
Sexual Orientation | ||||
 Homosexual | 589 (34.6%) | 234 (31.9%) | 79 (28.2%) | 107 (31.3%) |
 Bisexual | 611 (35.9%) | 263 (35.8%) | 101 (36.1%) | 135 (39.5%) |
 Other | 503 (29.%) | 237 (32.3%) | 100 (35.7%) | 100 (29.2%) |
 Missing | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
 p-value |  | 0.001 | 0.019 | 0.001 |
Qualifications | ||||
 No secondary | 189 (11.1%) | 109 (14.9%) | 47 (16.8%) | 44 (12.9%) |
 Secondary | 791 (46.4%) | 323 (44.0%) | 130 (46.4%) | 164 (48.0%) |
 Post secondary | 526 (30.9%) | 202 (27.5%) | 66 (23.6%) | 88 (25.7%) |
 Others | 153 (9.0%) | 84 (11.4%) | 35 (12.5%) | 38 (11.1%) |
 Missing | 44 (2.6%) | 16 (2.2%) | 2 (0.1%) | 8 (2.3%) |
 p-value |  | 0.147 | 0.091 | 0.357 |
Substance use | ||||
 Yes | 1179 (69.2%) | 531 (72.3%) | 195 (69.6%) | 247 (72.2%) |
 No | 524 (30.8%) | 203 (27.7%) | 85 (30.4%) | 95 (27.3%) |
 Missing | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
 p-value |  | 0.459 | 0.445 | 0.715 |
Marital Status | ||||
 Single | 968 (56.8%) | 387 (52.7%) | 133 (47.5%) | 194 (56.7%) |
 Married/Civil Partner | 500 (29.4%) | 230 (31.3%) | 90 (32.1%) | 87 (25.4%) |
 Separated/Divorced/Widowed | 179 (10.5%) | 98 (13.4%) | 50 (17.9%( | 54 (15.8%) |
 Missing | 56 (3.3%) | 19 (2.6%) | 7 (2.5%) | 7 (2.0%) |
 p-value |  | 0.003 | < 0.001 | 0.211 |
Ethnicity | ||||
 British white | 1332 (78.2%) | 610 (83.1%) | 214 (76.4%) | 290 (84.8%) |
 European white | 48 (2.8%) | 16 (2.2%) | 7 (2.5%) | 3 (0.0%) |
 Non-white | 323 (19.0%) | 108 (14.7%) | 59 (21.1%) | 49 (14.3%) |
 Missing | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
 p-value |  | < 0.001 | 0.193 | 0.009 |
Had a chronic mental or physical condition for the past 12-months | ||||
 Yes | 600 (32.4%) | 322 (43.9%) | 141 (50.4%) | 161 (47.1%) |
 No | 1250 (67.5%) | 411 (56.0%) | 139 (49.6%) | 181 (52.9%) |
 Missing | 2 (0.0%) | 1 (0.0%) | 0 (0.0%) | 0 (0.0%) |
 p-value |  | < 0.001 | < 0.001 | < 0.001 |
Diagnosed with clinical depression | ||||
 Yes | 296 (17.4%) | 181 (24.6%) | 80 (28.6%) | 108 (31.6%) |
 No | 1407 (82.6%) | 553 (75.4%) | 200 (71.4%) | 234 (68.4%) |
 Missing | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
 p-value |  | < 0.001 | < 0.001 | < 0.001 |
SF-12 PCS score | ||||
 Mean (SD) | 51.01 (9.821) | 49.3 (11.2) | 47.7 (12.0) | 48.7 (12.2) |
 Missing | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
 p-value |  | < 0.001 | < 0.001 | < 0.001 |
Neighbourhood cohesion | ||||
 Mean (SD) | 3.397 (0.816) | 3.380 (0.836) | 3.273 (0.876) | 3.301 (0.887) |
 Missing | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) |
 p-value |  | 0.244 | 0.003 | 0.009 |