Table 3.
Logistic Regression Models Estimating Limited Health Literacy against the Newest Vital Sign
| SILS |
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| Model | Demographics Only | Difficulty with Written Information | Confidence Filling out Medical Forms | Help Reading Hospital Materials | BHLS | |||||||||||||||
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| Predictors | OR | 95% CI* | P value | OR | 95% CI* | P value | OR | 95% CI* | P value | OR | 95% CI* | P value | OR | 95% CI* | P value | |||||
| Age | 1.02 | 1.01 | 1.04 | <.01 | 1.02 | 1.01 | 1.04 | .01 | 1.02 | 1.01 | 1.04 | <.01 | 1.02 | 1.01 | 1.04 | <.01 | 1.02 | 1.01 | 1.04 | .01 |
| Sex (reference = male) | ||||||||||||||||||||
| Female | 0.93 | 0.60 | 1.44 | .75 | 0.95 | 0.61 | 1.48 | .83 | 0.92 | 0.60 | 1.43 | .72 | 0.96 | 0.62 | 1.49 | .85 | 0.94 | 0.06 | 1.46 | .79 |
| Race (reference = white) | ||||||||||||||||||||
| Black | 3.51 | 2.27 | 5.43 | <.01 | 3.50 | 2.25 | 5.45 | <.01 | 3.41 | 2.20 | 5.28 | <.01 | 3.41 | 2.20 | 5.29 | <.01 | 3.33 | 2.14 | 5.18 | <.01 |
| Education (reference = high school) | ||||||||||||||||||||
| <High school | 2.06 | 1.03 | 4.13 | 0.04 | 1.68 | 0.82 | 3.44 | .15 | 1.97 | 0.98 | 3.97 | .06 | 1.84 | 0.97 | 3.73 | .06 | 1.75 | 0.86 | 3.57 | .12 |
| >High school | 0.40 | 0.25 | 0.62 | <.01 | 0.43 | 0.27 | 0.67 | <.01 | 0.42 | 0.27 | 0.67 | <.01 | 0.41 | 0.26 | 0.64 | <.01 | 0.44 | 0.28 | 0.67 | <.01 |
| Difficulty with written information (SILS) (reference = rarely/never) | ||||||||||||||||||||
| Always/often/sometimes | 2.86 | 1.50 | 5.46 | <.01 | ||||||||||||||||
| Confidence filling out medical forms (SILS) (reference = quite a bit/extremely confident) | ||||||||||||||||||||
| Not at all/a little bit/somewhat | 1.61 | 1.03 | 2.52 | .04 | ||||||||||||||||
| Help reading hospital materials (SILS) (reference = rarely/never) | ||||||||||||||||||||
| Always/often/sometimes | 1.80 | 1.08 | 3.00 | .02 | ||||||||||||||||
| BHLS | 0.85 | 0.78 | .94 | <.01 | ||||||||||||||||
| Goodness of fit statistics | ||||||||||||||||||||
| R 2 | 0.203 | 0.232 | 0.214 | 0.216 | 0.235 | |||||||||||||||
| AIC | 534.75 | 525.27 | 532.29 | 531.46 | 524.15 | |||||||||||||||
| AUROC | 0.734 | 0.749 | 0.738 | 0.741 | 0.749 | |||||||||||||||
*
For 95% confidence interval (CI) values, the lower limit is set on the left and the upper limit is on the right.
AIC, Akaike information criterion; AUROC, area under the receiver operator characteristics curve; BHLS, Brief Health Literacy Screen; OR, odds ratio; SILS, Single Item Literacy Screener.