Table 1.
Characteristics of unmatched and matched samples.
| Unmatched sample
|
Matched sample
|
||||||
|---|---|---|---|---|---|---|---|
| Total (N = 53 420) | Black (N = 1022) | White (N = 52 398) | Black for all Models (N = 1022) | Model 1: White (N = 1022) | Model 2: White (N = 1022) | Model 3: White (N = 1022) | |
| Age [mean (SD)] | 56.4 (8.1) | 52.0 (7.7) | 56.5 (8.1) | 52.0 (7.7) | 51.8 (8.1) | 51.7 (8.2) | 52.0 (8.1) |
| Sex [N (%)] | |||||||
| Female | 32 506 (60.8) | 701 (68.6) | 31 805 (60.7) | 701 (68.6) | 692 (67.7) | 678 (66.3) | 697 (68.2) |
| Male | 20 914 (39.2) | 321 (31.4) | 20 593 (39.3) | 321 (31.4) | 330 (32.3) | 344 (33.7) | 325 (31.8) |
| Attended college [N (%)] | |||||||
| Yes | 19 549 (36.6) | 403 (39.4) | 19 146 (36.5) | 403 (39.4) | 396 (38.8) | 379 (37.1) | 405 (39.6) |
| No | 33 871 (63.4) | 619 (60.6) | 33 252 (63.5) | 619 (60.6) | 626 (61.2) | 643 (62.9) | 617 (60.4) |
| Employment status [N (%)] | |||||||
| Unemployed | 4130 (7.7) | 151 (14.8) | 3979 (7.6) | 151 (14.8) | 136 (13.3) | 103 (10.1) | 121 (11.8) |
| Retired | 18 256 (34.2) | 135 (13.2) | 18 121 (34.6) | 135 (13.2) | 186 (18.2) | 194 (19.0) | 203 (19.9) |
| Employed | 31 034 (58.1) | 736 (72.0) | 30 298 (57.8) | 736 (72.0) | 700 (68.5) | 725 (70.9) | 698 (68.3) |
| Nocturnal sleep duration [N (%)] | |||||||
| Short (≤6 h) | 12 978 (24.3) | 513 (50.2) | 12 465 (23.8) | 513 (50.2) | 522 (51.1) | 233 (22.8) | 233 (22.8) |
| Adequate (7–8 h) | 37 730 (70.6) | 468 (45.8) | 37 262 (71.1) | 468 (45.8) | 430 (42.1) | 734 (71.8) | 735 (71.9) |
| Long (≥9 h) | 2712 (5.1) | 41 (4.0) | 2671 (5.1) | 41 (4.0) | 70 (6.8) | 55 (5.4) | 54 (5.3) |
| Morning–evening type [N (%)] | |||||||
| Morning | 14 011 (26.2) | 376 (36.8) | 13 635 (26.0) | 376 (36.8) | 274 (26.8) | 391 (38.3) | 278 (27.2) |
| Intermediate | 34 939 (65.4) | 549 (53.7) | 34 390 (65.6) | 549 (53.7) | 648 (63.4) | 524 (51.3) | 633 (61.9) |
| Evening | 4470 (8.4) | 97 (9.5) | 4373 (8.4) | 97 (9.5) | 100 (9.8) | 107 (10.5) | 111 (10.9) |
| Current smoker [N (%)] | |||||||
| Yes | 2943 (5.5) | 73 (7.1) | 2870 (5.5) | 73 (7.1) | 66 (6.5) | 70 (6.8) | 87 (8.5) |
| No | 50 477 (94.5) | 949 (92.9) | 49 528 (94.5) | 949 (92.9) | 956 (93.5) | 952 (93.2) | 935 (91.5) |
| Caffeine [N (%)] | |||||||
| Yes | 45 795 (85.7) | 912 (89.2) | 44 883 (85.7) | 912 (89.2) | 913 (89.3) | 914 (89.4) | 897 (87.8) |
| No | 7625 (14.3) | 110 (10.8) | 7515 (14.3) | 110 (10.8) | 109 (10.7) | 108 (10.6) | 125 (12.2) |
| Computer use (h/day) [mean (SD)] | 1.2 (1.4) | 1.8 (2.0) | 1.2 (1.4) | 1.8 (2.0) | 1.8 (2.2) | 1.8 (2.2) | 1.7 (2.2) |
| TV use (h/day) [mean (SD)] | 2.6 (1.5) | 3.0 (2.1) | 2.6 (1.5) | 3.0 (2.1) | 2.9 (1.7) | 3.1 (2.0) | 3.0 (1.9) |
| Time spent outdoors (h/day) [mean (SD)] | |||||||
| Summer | 3.6 (2.4) | 3.7 (2.7) | 3.6 (2.4) | 3.7 (2.7) | 3.6 (2.6) | 3.7 (2.8) | 3.7 (2.7) |
| Winter | 1.7 (1.7) | 2.0 (2.2) | 1.7 (1.7) | 2.0 (2.2) | 2.0 (2.2) | 2.2 (2.5) | 2.1 (2.4) |
| Physical activity (min/week) [mean (SD)] | |||||||
| Walking | 327.0 (345.8) | 275.3 (291.2) | 328.0 (346.7) | 275.3 (291.2) | 277.9 (276.0) | 271.1 (261.1) | 286.0 (295.5) |
| Moderate | 289.4 (327.3) | 250.0 (281.7) | 290.2 (328.1) | 250.0 (281.7) | 241.6 (264.6) | 250.1 (272.6) | 253.7 (293.6) |
| Vigorous | 136.9 (137.9) | 146.5 (150.5) | 136.7 (137.7) | 146.5 (150.5) | 147.4 (175.8) | 142.3 (152.5) | 146.4 (166.9) |
| Home density [N (%)] | |||||||
| Urban | 45 754 (85.7) | 1016 (99.4) | 44 738 (85.4) | 1016 (99.4) | 1013 (99.1) | 1009 (98.7) | 1015 (99.3) |
| Rural | 7666 (14.3) | 6 (0.6) | 7660 (14.6) | 6 (0.6) | 9 (0.9) | 13 (1.3) | 7 (0.7) |
| Bipolar/major depression status [N (%)] | |||||||
| Yes | 14 032 (26.3) | 211 (20.7) | 13 821 (26.4) | 211 (20.7) | 230 (22.5) | 218 (21.3) | 227 (22.2) |
| No | 39 388 (73.7) | 811 (79.3) | 38 577 (73.6) | 811 (79.3) | 792 (77.5) | 804 (78.7) | 795 (77.8) |
| Overweight/obese [N (%)] | |||||||
| Yes | 33 229 (62.2) | 801 (78.4) | 32 428 (61.9) | 801 (78.4) | 804 (78.7) | 801 (78.4) | 817 (79.9) |
| No | 20 191 (37.8) | 221 (21.6) | 19 970 (38.1) | 221 (21.6) | 218 (21.3) | 221 (21.6) | 205 (20.1) |
| Diabetes [N (%)] | |||||||
| Yes | 1763 (3.3) | 85 (8.3) | 1678 (3.2) | 85 (8.3) | 85 (8.3) | 85 (8.3) | 95 (9.3 |
| No | 51 657 (96.7) | 937 (91.7) | 50 720 (96.8) | 937 (91.7) | 937 (91.7) | 937 (91.7) | 927 (90.7) |
| Hypertension [N (%)] | |||||||
| Yes | 12 664 (23.7) | 346 (33.4) | 12 318 (23.5) | 346 (33.4) | 343 (33.6) | 340 (33.3) | 354 (34.6) |
| No | 40 697 (76.2) | 671 (65.7) | 40 026 (76.4) | 671 (65.7) | 678 (66.3) | 679 (66.4) | 662 (64.8) |
| Don’t know | 59 (0.1) | 5 (0.5) | 54 (0.1) | 5 (0.5) | 1 (0.1) | 3 (0.3) | 6 (0.6) |
| Angina [N (%)] | |||||||
| Yes | 1092 (2.0%) | 21 (2.1) | 1071 (2.0%) | 21 (2.1) | 17 (1.7) | 23 (2.3) | 17 (1.7) |
| No | 52 269 (97.9) | 996 (97.5) | 51 273 (97.9) | 996 (97.5) | 1004 (98.2) | 996 (97.5) | 999 (97.7) |
| Don’t know | 59 (0.1) | 5 (0.5) | 54 (0.1) | 5 (0.5) | 1 (0.1) | 3 (0.3) | 6 (0.6%) |
| Heart attack [N (%)] | |||||||
| Yes | 763 (1.4) | 15 (1.5%) | 748 (1.4%) | 15 (1.5%) | 18 (1.8%) | 11 (1.1%) | 11 (1.1%) |
| vNo | 52 598 (98.5) | 1002 (98.0) | 51 596 (98.5) | 1002 (98.0) | 1003 (98.1) | 1008 (98.6) | 1005 (98.3) |
| Don’t know | 59 (0.1) | 5 (0.5) | 54 (0.1) | 5 (0.5) | 1 (0.1) | 3 (0.3) | 6 (0.6) |
| Stroke [N (%)] | |||||||
| Yes | 581 (1.1) | 8 (0.8) | 573 (1.1) | 8 (0.8) | 6 (0.6) | 6 (0.6) | 9 (0.9) |
| No | 52 780 (98.8) | 1009 (98.7) | 51 771 (98.8) | 1009 (98.7) | 1015 (99.3) | 1013 (99.1) | 1007 (98.5) |
| Don’t know | 59 (0.1) | 5 (0.5) | 54 (0.1) | 5 (0.5) | 1 (0.1%) | 3 (0.3) | 6 (0.6) |
| Narcolepsy [N (%)] | |||||||
| Yes | 291 (0.5) | 20 (2.0) | 271 (0.5) | 20 (2.0) | 17 (1.7) | 23 (2.3) | 16 (1.6) |
| No | 53 129 (99.5) | 1002 (98.0) | 52 127 (99.5) | 1002 (98.0) | 1005 (98.3) | 999 (97.7) | 1006 (98.4) |
| Insomnia [N (%)] | |||||||
| Yes | 13 992 (26.2) | 221 (21.6) | 13 771 (26.3) | 221 (21.6) | 212 (20.7) | 231 (22.6) | 216 (21.1) |
| No | 39 428 (73.8) | 801 (78.4) | 38 627 (73.7) | 801 (78.4) | 810 (79.3) | 791 (77.4) | 806 (78.9) |
| Season of birth [N (%)] | |||||||
| Spring | 14 251 (26.7) | 277 (27.1) | 13 974 (26.7) | 277 (27.1) | 270 (26.4) | 260 (25.4) | 287 (28.1) |
| Summer | 13 557 (25.4) | 241 (23.6) | 13 316 (25.4) | 241 (23.6) | 244 (23.9) | 258 (25.2) | 237 (23.2) |
| Fall | 12 634 (23.7) | 240 (23.5) | 12 394 (23.6) | 240 (23.5) | 257 (25.2) | 243 (23.8) | 250 (24.5) |
| Winter | 12 978 (24.3) | 264 (25.8) | 12 714 (24.3) | 264 (25.8) | 251 (24.6) | 261 (25.5) | 248 (24.3) |
| Season of assessment [N (%)] | |||||||
| Spring | 13 919 (26.1) | 304 (29.8) | 13 615 (26.0) | 304 (29.8) | 265 (25.9) | 284 (27.8) | 264 (25.8) |
| Summer | 15 913 (29.8) | 214 (20.9) | 15 699 (29.9) | 214 (20.9) | 233 (22.8) | 261 (25.5%) | 267 (26.1) |
| Fall | 14 522 (27.2) | 266 (26.0) | 14 256 (27.2) | 266 (26.0) | 323 (31.6) | 304 (29.8) | 298 (29.2) |
| Winter | 9066 (17.0) | 238 (23.3) | 8828 (16.9) | 238 (23.3) | 201 (19.7) | 173 (16.9) | 193 (18.9) |