Table 1. Demographic characteristics of study sample.
*P-value < 0.05.
| Variable | Healthy/Mild periodontitis N=1842 n(%) | Moderate periodontitis N=985 n(%) | Severe periodontitis N=276 n(%) | P-value |
| Age | <0.001* | |||
| 30-34 | 331(18.0) | 109(11.1) | 13 (4.7) | |
| 35-49 | 832 (45.2) | 349 (35.4) | 71 (25.7) | |
| 50-64 | 561 (30.5) | 396 (40.2) | 159 (57.6) | |
| >64 | 118 (6.4) | 131 (13.3) | 33 (12.0) | |
| Gender | <0.001* | |||
| Males | 768 (41.7) | 546 (55.4) | 186 (67.4) | |
| Females | 1074 (58.3) | 439 (44.6) | 90 (32.6) | |
| Diabetes | 0.419 | |||
| Diabetic or borderline | 177 (9.6) | 107 (10.9) | 32 (11.6) | |
| Non diabetic | 1662 (90.4) | 877 (89.1) | 244 (88.4) | |
| Smoking | 0.445 | |||
| Current or former | 655 (41.6) | 365 (44.3) | 103 (43.1) | |
| Never | 919 (58.4) | 459 (55.7) | 136 (56.9) | |
| Race | <0.001* | |||
| Mexican American | 381 (20.7) | 288 (29.2) | 78 (28.3) | |
| Non-Hispanic white | 845 (45.9) | 309 (31.4) | 75 (27.2) | |
| Non-Hispanic black | 303 (16.4) | 239 (24.3) | 93 (33.7) | |
| Others | 313 (17.0) | 149 (15.1) | 30 (10.9) | |
| Federal poverty level | <0.001* | |||
| <100% | 232 (13.6) | 254 (28.2) | 90 (35.7) | |
| 100% to 199% | 343 (20.1) | 254 (28.2) | 70 (27.8) | |
| 200% to 399% | 472 (27.6) | 228 (25.3) | 62 (24.6) | |
| ≥400% | 662 (38.7) | 165 (18.3) | 30 (11.9) | |
| Last dental visit | 0.359 | |||
| ≤6 months | 879 (47.8) | 463 (47.1) | 139 (50.4) | |
| >6 months -1 year ago | 247 (13.4) | 160 (16.3) | 38 (13.8) | |
| >1 year - 2 years ago | 177 (9.6) | 100 (10.2) | 29 (10.5) | |
| >2 years, or never | 534 (29.1) | 261 (26.5) | 70 (25.4) | |
| Education level | <0.001* | |||
| 0 to 11th grade | 229 (12.4) | 277 (28.2) | 106 (38.4) | |
| High school graduate | 319 (17.3) | 270 (27.4) | 80 (29.0) | |
| Above high school | 1294 (70.2) | 437 (44.4) | 90 (32.6) |