Comparison of participants versus nonparticipants based on household environment.
| Household environment* | % of participants | % of nonparticipants |
|---|---|---|
| Family household w/o children | 44 | 49 |
| Family household w/children ≤18 | 38 | 30 |
| Female householder w/children ≤18 | 1 | 4 |
| Male householder w/children ≤18 | 1 | 2 |
| Householder living alone | 16 | 15 |
↵* Sample size = 188, chi-square = 3.1242 (P = 0.54, DF = 4).