Table 2.
Bivariate analysis of characteristics of participants in the 65- to 74-year-old group in relation to their periodontal status
| Variable | Overall | Degree of periodontitis | P valuea | ||
|---|---|---|---|---|---|
| CAL ≤ 3 mm | CAL = 4–5 mm | CAL ≥ 6 mm | |||
| Total, n (%) | 4117 (100.0) | 830 (20.2) | 1428 (34.7) | 1859 (45.2) | |
| Socioeconomic characteristics | |||||
| Sex, n (%) | < 0.001 | ||||
| Female† | 2050 (49.8) | 488 (58.8) | 772 (54.1) | 790 (42.5) | |
| Male | 2067 (50.2) | 342 (41.2) | 656 (45.9) | 1069 (57.5) | |
| Missing values | |||||
| Area, n (%) | 0.002 | ||||
| Urban† | 1996 (48.5) | 443 (53.4) | 697 (48.8) | 856 (46.0) | |
| Rural | 2121 (51.5) | 387 (46.6) | 731 (51.2) | 1003 (54.0) | |
| Missing values | |||||
| Educational level, n (%) | 0.198 | ||||
| ≤ 9 years† | 3897 (94.7) | 785 (94.6) | 1340 (93.9) | 1772 (95.3) | |
| > 9 years | 219 (5.3) | 45 (5.4) | 87 (6.1) | 87 (4.7) | |
| Missing values | |||||
| Household income per capita, n (%) | 0.012 | ||||
| Less than RMB 5000/person† | 1186 (28.8) | 196 (23.6) | 433 (30.3) | 557 (30.0) | |
| RMB 5000 to RMB 15,000/person | 1008 (24.5) | 221 (26.6) | 328 (23.0) | 459 (24.7) | |
| More than RMB 15,000/person | 1097 (26.6) | 243 (29.3) | 385 (27.0) | 469 (25.2) | |
| Prefer not to answer c | 826 (20.1) | 170 (20.5) | 282 (19.7) | 374 (20.1) | |
| Missing values | |||||
| Oral health-related behaviours | |||||
| Toothbrushing frequency, n (%) | < 0.001 | ||||
| < Once per day† | 3370 (81.9) | 731 (88.1) | 1187 (83.1) | 1452 (78.1) | |
| ≥ Once per day | 747 (18.1) | 99 (11.9) | 241 (16.9) | 407 (21.9) | |
| Missing values | |||||
| Use of dental floss, n (%) | 0.073 | ||||
| No† | 4176 (94.8) | 2761 (93.8) | 1087 (96.7) | 328 (96.8) | |
| Yes | 230 (5.2) | 183 (6.2) | 36 (3.2) | 11 (3.2) | |
| Missing values | |||||
| Use of a toothpick, n (%) | 0.006 | ||||
| No† | 2076 (50.4) | 423 (51.0) | 673 (47.1) | 980 (52.7) | |
| Yes | 2041 (49.6) | 407 (49.0) | 755 (52.9) | 879 (47.3) | |
| Missing values | |||||
| Frequency of dessert consumption, n (%) | 0.895 | ||||
| < Twice a day† | 866 (21.0) | 179 (21.6) | 296 (20.7) | 391 (21.0) | |
| ≥ Twice a day | 3251 (79.0) | 651 (78.4) | 1132 (79.3) | 1468 (79.0) | |
| Missing values | |||||
| Smoking status, n (%) | < 0.001 | ||||
| Never† | 1537 (37.3) | 247 (29.8) | 461 (32.3) | 829 (44.6) | |
| Current (former) | 2580 (62.7) | 583 (70.2) | 967 (67.7) | 1030 (55.4) | |
| Missing values | |||||
| Alcohol consumption, n (%) | 0.010 | ||||
| Ceased† | 390 (9.5) | 68 (8.2) | 114 (8.0) | 208 (11.2) | |
| Rarely/never | 156 (3.8) | 28 (3.4) | 49 (3.4) | 79 (4.2) | |
| Daily | 3217 (78.1) | 675 (81.3) | 1142 (80.0) | 1400 (75.3) | |
| Weekly | 353 (8.6) | 59 (7.1) | 123 (8.6) | 171 (9.2) | |
| Missing values b | 1 (0) | 0 (0) | 0 (0) | 1 (0.1) | |
| Systemic diseases associated with periodontitis | |||||
| Diabetes, n (%) | 0.471 | ||||
| No† | 3617 (87.9) | 724 (87.2) | 1247 (87.3) | 1646 (88.5) | |
| Yes | 500 (12.1) | 106 (12.8) | 181 (12.7) | 213 (11.5) | |
| Missing values | |||||
| Caries type, n (%; 95% CI) | |||||
| Type A | 2169 (52.7; 51.1–54.2) | 443 (53.4; 49.9–56.8) | 820 (57.4; 54.8–60.0) | 906 (48.7; 46.4–51.0) | < 0.001 |
| Type B | 2464 (59.8; 58.3–61.4) | 398 (48.0; 44.5–51.4) | 846 (59.2; 56.6–61.8) | 1220 (65.6; 63.4–67.8) | < 0.001 |
| Type C | 708 (17.2; 16.1–18.4) | 70 (8.4; 6.6–10.5) | 231 (16.2; 14.3–18.2) | 407 (21.9; 20.0–23.8) | < 0.001 |
| Type ABC | 3326 (80.8; 79.5–82.0) | 616 (74.2; 71.1–77.2) | 1178 (82.5; 80.4–84.4) | 1532 (82.4; 80.6–84.1) | < 0.001 |
Covariates with P ≤ 0.25 were included in the ordered logistic regression
95% CI, 95% Confidence intervals
aChi-square test
b,cStatistical analyses did not include missing values and individuals who preferred not to answer
†Reference