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Table 1 Analysis of differences before and after propensity score matching

From: The relationship between hormone replacement therapy and periodontal disease in postmenopausal women: a cross-sectional study the Korea National Health and Nutrition Examination Survey from 2007 to 2012

Characteristics Group Before matching (5,482) After matching (2,070)
HRT- (4,447) HRT+ (1,035) ×2 HRT- (1,035) HRT+ (1,035) ×2
Education Elementary and below 2,785 (62.63) 460 (44.44) < 0.001*** 460 (44.44) 460 (44.44) 1.000
Middle 693 (15.58) 218 (21.06) 218 (21.06) 218 (21.06)
High and above 969 (21.79) 357 (34.49) 357 (34.49) 357 (34.49)
Family incomea Low 1,543 (34.70) 214 (20.68) < 0.001*** 214 (20.68) 214 (20.68) 1.000
Middle low 1,228 (27.61) 289 (27.92) 289 (27.92) 289 (27.92)
Middle upper 867 (19.50) 251 (24.25) 251 (24.25) 251 (24.25)
Upper 809 (18.19) 281 (27.15) 281 (27.15) 281 (27.15)
Age of menopause(y) < 45 637 (14.32) 163 (15.75) 0.242 163 (15.75) 163 (15.75) 1.000
≥45 3,810 (85.68) 872 (84.25) 872 (84.25) 872 (84.25)
Periodontal disease No 2,657 (59.75) 686 (66.28) < 0.001*** 629 (60.77) 686 (66.28) 0.009**
Yes 1,790 (40.25) 349 (33.72) 406 (39.23) 349 (33.72)
Age (y) 45–54 990 (22.26) 265 (25.60) < 0.001*** 331 (31.98) 265 (25.60) < 0.001***
55–64 1,726 (38.81) 516 (49.86) 394 (38.07) 516 (49.86)
65–74 1,731 (38.93) 254 (24.54) 310 (29.95) 254 (24.54)
Body mass indexb Normal 2,662 (59.86) 655 (63.29) 0.042* 654 (63.19) 655 (63.29) 0.964
Obese 1,785 (40.14) 380 (36.71) 381 (36.81) 380 (36.71)
Alcohol No 1,459 (32.81) 266 (25.70) < 0.001*** 321 (31.01) 266 (25.70) 0.019*
Past 1,868 (42.01) 449 (43.38) 432 (41.74) 449 (43.38)
Drinking 1,120 (25.19) 320 (30.92) 282 (27.25) 320 (30.92)
Smoking No 4,127 (92.80) 963 (93.04) 0.788 961 (92.85) 963 (93.04) 0.864
Yes 320 (07.20) 72 (06.96) 74 (07.15) 72 (06.96)
Dental visit < 1 years No 3,531 (79.40) 741 (71.59) < 0.001*** 760 (73.43) 741 (71.59) 0.351
Yes 916 (20.60) 294 (28.41) 275 (26.57) 294 (28.41)
Use of oral care products No 3,337 (75.04) 627 (60.58) < 0.001*** 685 (66.18) 627 (60.58) 0.008**
Yes 1,110 (24.96) 408 (39.42) 350 (33.82) 408 (39.42)
Frequency of tooth brushing per day < 3 2,852 (64.13) 608 (58.74) 0.001** 581 (56.14) 608 (58.74) 0.231
≥3 1,595 (35.87) 427 (41.26) 454 (43.86) 427 (41.26)
  1. HRT hormone replacement therapy
  2. a Income quartile. bAsia-Pacific Standard: normal, less than 25 kg/m2; obese, more than 25 kg/m2
  3. *p < 0.05, **p < 0.01, ***p < 0.001