Table 1.
Demographic and Social Characteristics of PBC Cases and Controls
| Characteristic | Cases (%) (n = 1,032) | Controls (%) (n = 1,041) | Unadjusted P Value* |
|---|---|---|---|
| Sex | NS | ||
| Female | 955 (93%) | 960 (92%) | |
| Male | 77 (7%) | 81 (8%) | |
| Mean age (y) | 58 ± 10 | 58 ± 10 | NS |
| Mean age at diagnosis of PBC | 51 ± 10 | NA | — |
| Ethnicity | NS | ||
| White/Caucasian | 1,010 (98%) | 1,024 (98%) | |
| African American | 8 (0.8%) | 9 (0.9%) | |
| Asian | 7 (0.7%) | 6 (0.6%) | |
| Pacific Islander | 1 (0.1%) | 1 (0.1%) | |
| American Indian | 2 (0.2%) | 1 (0.1%) | |
| Other | 4 (0.4%) | 0 (0%) | |
| Education | NS | ||
| Less than high school | 50 (5%) | 49 (5%) | |
| High school | 250 (24%) | 239 (25%) | |
| Some college/vocational school | 350 (34%) | 303 (32%) | |
| College | 198 (19%) | 198 (21%) | |
| Post-college | 184 (18%) | 164 (17%) | |
| Marital status | <.0001 | ||
| Single, never married | 62 (6%) | 58 (6%) | |
| Married/living as married | 767 (74%) | 680 (65%) | |
| Other | 203 (20%) | 303 (29%) | |
| Household yearly income* | <.0001 | ||
| Low income (<40,000 USD) | 275 (27%) | 383 (39%) | |
| High income (≥40,000 USD) | 757 (73%) | 611 (61%) |
NOTE. Continuous variables are expressed as mean ± standard deviation.
*
Different set of categories.