Table 5. Sample characteristics for total and included vs. excluded participants, showing patterns in missingness.
SD, standard deviation
| Characteristic | Total with missing (%) | Included (%) | Excluded (%) | |
| Root Caries | No | 6520 (71%) | 5337 (86%) | 1183 (84%) |
| Yes | 1079 (12%) | 849 (14%) | 230 (16%) | |
| Missing | 1633 (18%) | 1633 | ||
| Seeking Urgent Dental Care | No | 6398 (69%) | 4447 (72%) | 1951 (68%) |
| Yes | 2663 (29%) | 1739 (28%) | 924 (32%) | |
| Missing | 171 (2%) | 171 | ||
| Age | Mean (SD) | 51.1 (17.7) | 49.7 (17.2) | 54.1 (18.2) |
| Gender | Male | 4479 (49%) | 2992 (48%) | 1487 (49%) |
| Female | 4753 (51%) | 3194 (52%) | 1559 (51%) | |
| Missing | 0 (0%) | 0 | ||
| Race/Ethnicity | Multi-race | 439 (5%) | 308 (5%) | 131 (4%) |
| White | 3217 (35%) | 2275 (37%) | 942 (31%) | |
| Black | 2459 (27%) | 1599 (26%) | 860 (28%) | |
| Mexican | 1057 (11%) | 700 (11%) | 357 (12%) | |
| Other | 940 (10%) | 606 (10%) | 334 (11%) | |
| Asian | 1120 (12%) | 698 (11%) | 422 (14%) | |
| Missing | 0 (0%) | 0 | ||
| Marital Status | Married | 5279 (57%) | 3653 (59%) | 1626 (54%) |
| Divorced | 2148 (23%) | 1312 (21%) | 836 (28%) | |
| Never married | 1795 (19%) | 1219 (20%) | 576 (19%) | |
| Missing | 0 (0%) | 0 | ||
| Education | Less than High School | 1760 (19%) | 943 (15%) | 817 (27%) |
| High School | 2225 (24%) | 1446 (23%) | 779 (26%) | |
| Greater than High School | 5232 (57%) | 3794 (61%) | 1438 (47%) | |
| Missing | 0 (0%) | 0 | ||
| Poverty | Poor | 1496 (16%) | 1084 (18%) | 412 (25%) |
| Near poor | 2114 (23%) | 1602 (26%) | 512 (31%) | |
| Not poor | 4218 (46%) | 3500 (57%) | 718 (44%) | |
| Missing | 1404 (15%) | 1404 | ||
| Alcohol | Never drank | 742 (8%) | 511 (8%) | 231 (13%) |
| Drank at least once | 7235 (78%) | 5675 (92%) | 1560 (87%) | |
| Missing | 1255 (14%) | 1255 | ||