Table 1 Baseline characteristics of study participants according to periodontal status in unmatched and matched cohorts
Variables | Full cohort | After propensity score matching | ||||
|---|---|---|---|---|---|---|
None or mild periodontitis (n = 1983) | Moderate to severe periodontitis (n = 1355) | Standardized differenceb | None or mild periodontitis (n = 1355) | Moderate to severe periodontitis (n = 1355) | Standardized differenceb | |
Demographics | ||||||
 Age (years)c | 57.3 (16.3) | 61.7 (14.5) | 0.23 | 61.8 (14.5) | 61.7 (14.5) | 0.005 |
 Country | ||||||
  Argentina | 1304 (65.8) | 177 (13.1) | 0.99 | 846 (62.4) | 177 (13.1) | 0.91 |
  France | 28 (1.4) | 11 (0.8) | 0.05 | 27 (2.0) | 11 (0.8) | 0.08 |
  Hungary | 182 (9.2) | 233 (17.2) | −0.20 | 141 (10.4) | 233 (17.2) | −0.17 |
  Italy | 97 (4.9) | 312 (23.0) | −0.49 | 89 (6.6) | 312 (23.0) | −0.42 |
  Poland | 200 (10.1) | 39 (2.9) | 0.22 | 119 (8.8) | 39 (2.9) | 0.19 |
  Portugal | 169 (8.5) | 464 (34.2) | −0.58 | 131 (9.7) | 464 (34.2) | −0.55 |
  Spain | 3 (0.2) | 119 (8.8) | −0.42 | 2 (0.2) | 119 (8.8) | −0.42 |
 Menc | 1116 (56.3) | 852 (62.9) | −0.10 | 838 (61.9) | 852 (62.9) | −0.02 |
 European race | 1899 (96.4) | 1246 (91.9) | 0.17 | 1297 (95.7) | 1246 (91.9) | 0.13 |
Socioeconomic characteristics | ||||||
 Current or former smokerc | 381 (31.2) | 408 (34.6) | −0.06 | 352 (26.0) | 408 (34.6) | −0.15 |
 Married | 859 (60.7) | 835 (68.0) | −0.12 | 583 (61.2) | 835 (68.0) | −0.12 |
 Secondary education | 466 (39.4) | 460 (40.4) | −0.02 | 331 (38.7) | 460 (40.4) | −0.03 |
 Employed | 218 (18.1) | 148 (12.9) | 0.12 | 149 (16.7) | 148 (12.9) | 0.09 |
 Family income above domestic averagec | 132 (7.4) | 106 (8.2) | −0.02 | 98 (7.6) | 106 (8.2) | −0.02 |
 Body mass index (kg/m2) | 26.9 (5.2) | 26.7 (5.2) | 0.04 | 26.9 (5.2) | 26.7 (5.2) | 0.04 |
Comorbid medical conditions | ||||||
 Myocardial infarction | 112 (10.0) | 138 (13.3) | −0.09 | 95 (11.7) | 138 (13.3) | −0.04 |
 Stroke | 88 (7.8) | 125 (12.0) | −0.12 | 70 (8.6) | 125 (12.0) | −0.12 |
 Diabetes mellitus | 338 (30.3) | 335 (29.4) | 0.02 | 238 (29.7) | 335 (29.4) | 0.005 |
Laboratory variables | ||||||
 Serum albumin (g/dL) | 3.7 (0.4) | 3.9 (0.4) | −0.41 | 3.7 (0.4) | 3.9 (0.4) | −0.41 |
 Serum phosphorous (mmol/L) | 1.6 (0.5) | 1.5 (0.5) | 0.16 | 1.5 (0.5) | 1.5 (0.5) | 0 |
 Serum calcium (mmol/L) | 2.2 (0.2) | 2.2 (0.2) | 0 | 2.2 (0.2) | 8.8 (0.8) | 0 |
 Hemoglobin (g/dL) | 11.0 (1.4) | 11.2 (1.3) | −0.12 | 11.1 (1.4) | 11.2 (1.3) | −0.06 |
Dialysis characteristics | ||||||
 Time treated with dialysis (months)c | 75.1 (54.9) | 84.6 (66.4) | −0.13 | 82.5 (59.1) | 84.6 (66.4) | −0.02 |
 Kt/Va | 1.7 (0.3) | 1.7 (0.3) | 0 | 1.6 (0.3) | 1.7 (0.3) | −0.27 |
 Mean arterial pressure (mmHg) | 89.0 (13.7) | 91.7 (13.7) | −0.16 | 88.8 (13.5) | 91.7 (13.7) | −0.17 |
Oral health practices and dental health | ||||||
 Number of teethc | 16.5 (9.4) | 17.1 (8.3) | −0.05 | 16.5 (9.2) | 17.1 (8.3) | −0.05 |
 Number of decayed, missing, filled teeth | 19.4 (8.9) | 19.2 (8.1) | 0.02 | 19.3 (8.8) | 19.2 (8.1) | 0.01 |
 Use of dental floss | 153 (7.8) | 115 (8.6) | −0.02 | 90 (6.7) | 115 (8.6) | −0.06 |
 Brushing teeth twice or more often per day | 1310 (67.1) | 854 (64.2) | 0.05 | 874 (65.2) | 854 (64.2) | 0.05 |