Comparison of baseline characteristics between participants in the whole UK Biobank cohort and those with various ocular measurements
| Total cohort (n=502 665) | Baseline visit of participants with VA data (n=117 175) | First repeat visit of participants with VA data (n=20 202) | Baseline visit of participants with OCT and fundus photography data (n=67 321) | First repeat visit of participants with OCT and fundus photography data (n=17 876) | ||||||
| N | Mean±SD/ n(%) | N | Mean±SD/ n(%) | N | Mean±SD/ n(%) | N | Mean±SD/ n(%) | N | Mean±SD/ n(%) | |
| Age at recruitment (years) | 502 643 | 56.5±8.1 | 117 175 | 56.8±8.1 | 20 201 | 57.1±7.4 | 67 321 | 56.8±8.2 | 17 876 | 57.1±7.4 |
| Gender | 502 650 | 117 175 | 20 201 | 67 292 | 17 876 | |||||
| Male | 229 182 (45.6) | 53 413 (45.6) | 9866 (48.8) | 30 688 (45.6) | 8774 (49.1) | |||||
| Females ((n)%) | 273 468 (54.4) | 63 762 (54.4) | 10 335 (51.2) | 36 604 (54.4) | 9102 (50.9) | |||||
| Ethnicity ((n)%) | 499 864 | 1 16 290 | 20 151 | 66 809 | 17 835 | |||||
| White | 472 825 (94.6) | 104 227 (89.6) | 19 713 (97.8) | 60 519 (90.6) | 17 440 (97.8) | |||||
| Chinese | 1574 (0.3) | 535 (0.4) | 43 (0.2) | 309 (0.5) | 40 (0.2) | |||||
| Asian | 9882 (2.0) | 4504 (3.9) | 137 (0.7) | 2178 (3.3) | 126 (0.7) | |||||
| Black | 8065 (1.6) | 4154 (3.6) | 89 (0.4) | 2158 (3.2) | 77 (0.4) | |||||
| Mixed/other | 7518 (1.5) | 2870 (2.5) | 169 (0.9) | 1645 (2.4) | 152 (0.9) | |||||
| Education level ((n)%) | 407 211 | 98 099 | 17 911 | 56 897 | 15 879 | |||||
| Less than ‘O’ level | 26 892 (6.6) | 6410 (6.5) | 692 (3.9) | 3708 (6.5) | 614 (3.9) | |||||
| ‘O’ level | 105 223 (25.8) | 24 300 (24.8) | 3900 (21.8) | 13 990 (24.6) | 3437 (21.6) | |||||
| ‘A’ level | 113 879 (28.0) | 26 826 (27.4) | 4700 (26.2) | 15 532 (27.3) | 4157 (26.2) | |||||
| Degree and above | 161 217 (39.6) | 40 563 (41.3) | 8619 (48.1) | 23 667 (41.6) | 7671 (48.3) | |||||
| Townsend Deprivation Index | 501 990 | −1.3±3.1 | 117 035 | −0.9±3.0 | 20 190 | −2.0±2.7 | 67 211 | −1.0±3.0 | 17 865 | −2.0±2.7 |
| BMI (kg/m2) | 499 588 | 27.4±4.8 | 116 510 | 27.4±4.8 | 20 156 | 26.9±4.5 | 66 941 | 27.4±4.8 | 17 835 | 26.9±4.5 |
| Smoking status ((n)%) | 501 724 | 116 371 | 20 154 | 66 879 | 17 831 | |||||
| Never | 273 588 (54.5) | 64 576 (55.5) | 11 897 (59.0) | 37 170 (55.6) | 10 489 (58.8) | |||||
| Former | 173 091 (34.5) | 40 047 (34.4) | 6988 (34.7) | 23 206 (34.7) | 6211 (34.8) | |||||
| Current | 52 985 (11.0) | 11 748 (10.1) | 1269 (6.3) | 6503 (9.7) | 1131 (6.4) | |||||
BMI, body mass index; OCT, optical coherence tomography; VA, visual acuity.