Table II.
Weighted* distribution (%)† of baseline sociodemographic characteristics and hip OA risk factors for the analytic and eligible baseline samples
| Analytic sample n = 1446 | Eligible baseline sample n = 2778 | |
|---|---|---|
| Sociodemographic characteristics | ||
| Age (years) | ||
| 45–54 | 52 | 30 |
| 55–64 | 26 | 29 |
| 65–74 | 18 | 28 |
| ≥75 | 5 | 13 |
| Median | 55 | 62 |
| Sex | ||
| Men | 42 | 43 |
| Women | 58 | 57 |
| Race | ||
| African American | 20 | 18 |
| White | 80 | 82 |
| Marital status | ||
| Never married | 4 | 3 |
| Married | 73 | 66 |
| Separated/divorced | 9 | 10 |
| Widowed | 13 | 22 |
| Highest education | ||
| <High school | 11 | 21 |
| Some/completed high school | 54 | 52 |
| >High school | 34 | 28 |
| Annual household income | ||
| $0–<$15,000 | 25 | 35 |
| $15,000–<$35,000 | 29 | 27 |
| ≥$35,000 | 28 | 17 |
| Don’t know | 7 | 9 |
| Refused | 11 | 12 |
| Hip OA risk factors | ||
| Self-reported BMI at age 18 (kg/m2) | ||
| Under or healthy weight (<25) | 92 | 90 |
| Overweight or obese (≥25) | 8 | 10 |
| Clinically measured BMI at study baseline (kg/m2) | ||
| Under or healthy weight (<25) | 31 | 34 |
| Overweight (25–<30) | 44 | 42 |
| Obese (≥30) | 25 | 24 |
| Obese Class I (30–<35) | 17 | 17 |
| Obese Class II–IV (≥35) | 7 | 6 |
| History of hip injury | ||
| No | 97 | 95 |
| Yes | 3 | 5 |
*
The analytic and eligible samples were weighted to the Johnston County population in 2000 and 1990, respectively. Differences in weighted numbers are due to the use of different sampling weights applied to the baseline and follow-up samples.
†
Percentages may not sum to 100% due to rounding.