TABLE 1.
Baseline characteristics of selected participants from National Health and Nutrition Examination Survey (NHANES) 1999–2016.
| Characteristics | RA (N = 906) | Non-RA (N = 8712) |
| Age | ||
| 20∼65 years | 430 (47.46%) | 6510 (74.72%) |
| ≥65 years | 476 (52.54%) | 2202 (25.28%) |
| Sex | ||
| Female | 480 (52.98%) | 4027 (46.22%) |
| Male | 426 (47.02%) | 4685 (53.78%) |
| BMI (kg/m2) | 29.73 ± 7.31 | 27.84 ± 6.21 |
| Poverty-income ratio | 2.75 ± 1.66 | 3.09 ± 1.65 |
| Education | ||
| Less than high school | 243 (26.82%) | 1717 (19.71%) |
| High school graduate | 348 (38.41%) | 3122 (35.84%) |
| More than high school | 315 (34.77%) | 3873 (44.46%) |
| Married | ||
| Yes | 527 (58.17%) | 5189 (59.56%) |
| No | 379 (41.83%) | 3523 (40.44%) |
| Diabetes | ||
| Yes | 154 (17.00%) | 636 (7.30%) |
| No | 752 (83.00%) | 8076 (92.70%) |
| Smoked at least 100 cigarettes in life | ||
| Yes | 585 (64.57%) | 4816 (55.28%) |
| No | 321 (35.43%) | 3896 (44.72%) |
| Frequency of alcohol drinks in the past 12 months, median (IQR) | 1 (0, 3) | 2 (1, 3) |
IQR, interquartile range; RA, rheumatoid arthritis.