Table 4.
Demographic and socioeconomic characteristics of matched cases and controls
| Demographic and socioeconomic characteristics | Cases (389) | Controls (389) | P a |
|---|---|---|---|
| Gender | |||
| Female | 369 (95%) | 368 (95%) | 0.8 |
| Male | 20 (5%) | 21 (5%) | |
| Race | |||
| White | 321 (83%) | 330 (85%) | 0.9 |
| African-American | 30 (8%) | 27 (7%) | |
| Asian | 4 (1%) | 6 (2%) | |
| Others | 7 (2%) | 4 (1%) | |
| More than one race | 20 (5%) | 17 (4%) | |
| Do not say | 7 (2%) | 5 (1%) | |
| Ethnicity | |||
| Non-Hispanic | 362 (93%) | 365 (94%) | 0.9 |
| Hispanic | 17 (4%) | 17 (4%) | |
| Do not say | 10 (3%) | 7 (2%) | |
| Age | |||
| Mean (SD) | 39.3 (11.0) | 39.5 (11.4) | 0.5 |
| Region of residence | |||
| Northeast | 70 (18%) | 68 (17%) | 0.4 |
| Midwest | 61 (16%) | 60 (15%) | |
| South | 171 (44%) | 176 (45%) | |
| West | 87 (22%) | 85 (22%) | |
| Education levelb | |||
| High school graduate or less | 66 (17%) | 59 (16%) | 0.1 |
| Some college | 169 (45%) | 147 (40%) | |
| College graduate | 79 (21%) | 93 (25%) | |
| Professional or graduate school | 64 (17%) | 71 (19%) | |
| Household incomec | |||
| Less than $25K | 97 (27%) | 86 (25%) | 0.8 |
| $25K–$50K | 111 (31%) | 124 (36%) | |
| $50K–$100K | 101 (29%) | 97 (28%) | |
| $100K+ | 45 (13%) | 39 (11%) |
a
P-value calculated using Wilcoxon rank test for continuous and ordinal variables and McNemar's test for categorical variables.
b
Eleven (3%) of cases and 19 (5%) of controls did not report education level.
c
Thirty-five (9%) of cases and 43 (11%) of controls did not report household income.