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Table 1 Baseline characteristics of the study participants

From: Relationship of rheumatoid arthritis and coronary artery disease in the Korean population: a nationwide cross-sectional study

Variables Frequency Weighted frequency*
RA group n = 238 Non-RA group n = 25,590 P RA group n = 938,122 Non-RA group n = 147,771,248 P
Age, years 64.40 ± 13.17 49.87 ± 16.67 <  0.001 61.39 ± 14.71 44.96 ± 15.96 <  0.001
Female sex, n (%) 201 (84.5) 14,712 (57.5%) <  0.001 801,097 (85.4) 74,517,785 (50.4%) <  0.001
Alcohol Intake <  0.001   <  0.001
 Nondrinker, n (%) 219 (92.0) 20,159 (78.8) 851,124 (90.7) 112,482,020 (76.1)
 Moderate drinker, n (%) 13 (5.5) 3560 (13.9) 58,045 (6.2) 24,128,683 (16.3)
 Heavy drinker, n (%) 6 (2.5) 1871 (7.3) 28,953 (3.1) 11,160,544 (7.6)
Current smoker, n (%) 19 (8.0) 5265 (20.6) <  0.001 79,400 (8.5) 37,895,669 (25.6) <  0.001
Degree of obesity 0.43   < 0.001
 Low, n (%) 11 (4.6) 1189 (4.6) 50,925 (5.4) 7,230,860 (4.9)
 Normal, n (%) 142 (59.7) 16,262 (63.5) 552,121 (58.9) 93,306,408 (63.1)
 Obese, n (%) 85 (35.7) 8139 (31.8) 335,076 (35.7) 47,233,980 (32.0)
Hypertension, n (%) 93 (39.1) 5643 (22.1) <  0.001 335,843 (35.8) 25,000,131 (16.9) <  0.001
Dyslipidemia, n (%) 33 (13.9) 2466(9.6) 0.03 120,048 (12.8) 11,675,583 (7.9) < 0.001
Diabetes mellitus, n (%) 42 (17.6) 2087 (8.2) <  0.001 171,300 (18.3) 9,271,183 (6.3) <  0.001
Coronary artery disease, n (%) 17 (7.1) 452 (1.8) <  0.001 62,174 (6.6) 1871,935 (1.3) <  0.001
  1. Data are presented as mean ± standard deviation
  2. *Weighted population according to individual weight provided by national surveys
  3. RA: rheumatoid arthritis