Table 2 Baseline characteristics of the risk and control groups in the elderly (age ≥ 65)

From: Oral health in adults with coronary artery disease and its risk factors: a comparative study using the Korea National Health and Nutrition Examination Survey data

Variables Categories Unadjusted data Propensity-matched data
Control (n = 758), M ± SD, n (%) At risk (n = 1933), M ± SD, n (%) p Control (n = 715), M ± SD, n (%) At risk (n = 715), M ± SD, n (%) p
Age 71.09 ± 0.182 72.78 ± 0.16 < .001 71.32 ± 0.19 71.18 ± 0.22 .623  
Sex Male 355 (45.0) 771 (39.4) .017 327 (43.9) 360 (49.7) .050
Female 403 (55.0) 1162 (60.6)   388 (56.1) 355 (50.3)  
Education level ≤ Middle school 522 (67.7) 1418 (71.9) .070 495 (68.1) 490 (69.0) .763
≥ High school 236 (32.3) 515 (28.1)   220 (31.9) 225 (31.0)  
Household income Middle-low 524 (67.6) 1472 (75.4) .001 497 (68.1) 493 (68.7) .817
Middle-high 234 (32.4) 461 (24.6)   218 (31.9) 222 (31.3)  
Marital status Married 754 (99.5) 1916 (99.1) .217 711 (99.5) 710 (99.3) .595
Single/others 4 (.5) 17 (.9)   4 (.5) 5 (.7)  
Family history of CVD No 537 (69.9) 1069 (53.8) < .001 495 (68.2) 498 (68.3) .973
Yes 221(30.1) 864 (46.2)   220 (31.8) 217 (31.7)  
Living area Urban 586 (82.1) 1462 (79.2) .138 160 (17.9) 183 (21.8) .077
Rural 172 (17.9) 471 (20.8)   555 (82.1) 532 (78.2)  
Employment None/housewife 451 (59.2) 1339 (71.8) < .001 438 (61.0) 452 (66.5) .057
Employed 307 (40.8) 594 (28.2)   277 (39.0) 263 (33.5)  
Smoking Never/ex-smoker 701 (91.8) 1787 (92.6) .550 665 (92.7) 645 (90.6) .198
Current smoker 57 (8.2) 146 (7.4)   50 (7.3) 70 (9.4)  
BMI < 25 kg/m2 556 (75.3) 1096 (57.0) < .001 514 (73.9) 485 (68.5) .069
≥ 25 kg/m2 202 (24.7) 837 (43.0)   201 (26.1) 230 (31.5)  
  1. CVD cardiovascular disease, BMI body mass index