Table 3. Logistic Regression Models Estimating Limited Health Literacy against the Newest Vital Sign

Model	Demographics Only				SILS												BHLS
Model	Demographics Only				Difficulty with Written Information				Confidence Filling out Medical Forms				Help Reading Hospital Materials				BHLS
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
R²	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.