| | Sample () | Subgroup willing to be tested () | Subgroup unwilling to be tested () |
| Age, mean (SD), years | 29.3 (6.2) | 29.3 (6.1) | 29.3 (6.3) |
| Race, % | | | | White | 87 | 84 | 91 | Black | 8 | 7 | 8 | Asian | 5 | 7 | 2 |
| Type of insurance,* % | | | | Medicare | 0 | 0 | 0 | Medicaid | 16 | 10 | 21 | Private/employer-provided | 83 | 89 | 79 | None | <1 | <1 | 0 |
| Marital status,* % | | | | Single, living alone | 5 | 2 | 8 | Single, living with partner | 25 | 23 | 27 | Single, living with roommates/parents | 10 | 11 | 9 | Married | 59 | 65 | 54 | Divorced | 1 | 0 | 2 | Widowed | 0 | 0 | 0 |
| Employment status, % | | | | Full time | 40 | 39 | 41 | Part Time | 24 | 21 | 27 | Unemployed | 14 | 14 | 14 | Homemaker/housewife | 16 | 16 | 15 | Full-time student | 5 | 7 | 2 | Other | 3 | 4 | 3 |
| Highest level of education, % | | | | Elementary | <1 | 0 | 1 | High school | 31 | 28 | 34 | Some college | 32 | 29 | 34 | Technical/other professional school | 5 | 5 | 4 | College | 20 | 22 | 18 | Postgraduate | 12 | 16 | 9 |
| 2004 household pretax income, % | | | | <$20,000 | 17 | 14 | 20 | $20,000 to $39,999 | 26 | 29 | 23 | $40,000 to $59,999 | 23 | 18 | 26 | $60,000 to $79,999 | 13 | 15 | 12 | $80,000 to $99,999 | 10 | 12 | 9 | ≥$100,000 | 10 | 12 | 9 |
| Age at first sexual intercourse, % | | | | 15 or younger | 20 | 19 | 20 | 16 or older | 80 | 81 | 80 |
| Estimated # of sexual partners, % | | | | 1 | 17 | 19 | 15 | 2 to 4 | 43 | 40 | 47 | 5 to 9 | 24 | 25 | 24 | 10 to 19 | 13 | 13 | 13 | 20 to 29 | 1 | 2 | <1 | 30 to 39 | <1 | <1 | 1 |
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