Table 1.
Characteristics of G&C study participants
| Characteristics | N = 21,051 | Missing (%) |
|---|---|---|
| Agea (years), mean (s.d.)/median (IQR) | 50.48 (14.81)/52 (39, 62) | — |
| Age (years) category, n (%) | ||
| 17–25 | 1,238 (5.9) | — |
| 26–35 | 2,900 (13.8) | |
| 36–45 | 3,439 (16.3) | |
| 46–55 | 4,701 (22.3) | |
| 56–65 | 5,084 (24.2) | |
| 66–75 | 3,322 (15.8) | |
| 76+ | 367 (1.7) | |
| Gendera, female/male/other, n (%) | 13,298 (63.2)/7,692 (36.5)/61 (0.3) | — |
| Ethnicitya, n (%) | ||
| African | 73 (0.4) | 5.4 |
| Asian | 148 (0.7) | |
| Mixed | 283 (1.4) | |
| Other | 126 (0.6) | |
| White | 19,292 (96.8) | |
| Smoking statusa, n (%) | ||
| Current smoker | 428 (5.4) | 62.2 |
| Nonsmoker | 4,568 (57.4) | |
| Past smoker | 2,959 (37.2) | |
| Alcohol usea (yes), n (%) | 7,424 (84.4) | 58.2 |
| BMIa (kg m−2), n (%) | ||
| Underweight (<18.5) | 122 (1.4) | |
| Healthy weight (18.5–24.9) | 3,812 (43.4) | 58.3 |
| Overweight (25–29.9) | 3,144 (35.8) | |
| Obese (≥30) | 1,709 (19.4) | |
| Multiple deprivation index, n (%) | ||
| High (1–3) | 3,474 (17.2) | 4.2 |
| Medium (4–7) | 8,334 (41.3) | |
| Low (8–10) | 8,351 (41.4) | |
| Educationa, n (%) | ||
| 1 (lowest) | 295 (3.9) | 64.4 |
| 2 | 2,019 (27.0) | |
| 3 | 748 (10.0) | |
| 4 (highest) | 4,427 (59.1) | |
| Worked nights 72 h before testa (yes), n (%) | 431 (2.0) | — |
| First language is Englisha, n (%) | 20,082 (96.9) | 1.5 |
aSelf-reported in response to questionnaire provided either by NIHR BioResource or Cognitive Test application.
IQR, interquartile range.participants will be no different