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Data are reported as a mean ± standard deviation.
| Age (years) | Midwest | West | Southeast | Northeast | p-value |
|---|---|---|---|---|---|
| < 20 (n=304) | 13.8 ± 3.9 | 13.1 ± 4.6 | 13.5 ± 4.7 | 14.5 ± 2.2 | 0.74 |
| 20–29 (n=808) | 11.1 ± 4.8 | 11.7 ± 4.2 | 10.8 ± 4.9 | 10.5 ± 4.7 | 0.58 |
| 30–39 (n=553) | 8.9 ± 5.1 | 10.3 ± 2.6 | 9.5 ± 5.0 | 8.6 ± 5.1 | 0.39 |
| 40–49 (n=378) | 7.9 ± 5.5 | 9.0 ± 4.8 | 8.4 ± 5.1 | 9.9 ± 4.5 | 0.24 |
| 50+ (n=107) | 5.8 ± 5.1 | 7.4 ± 5.7 | 7.0 ± 6.1 | 5.6 ± 5.5 | 0.70 |
