Table 3.

Logistic regression models.

		PD v.									Neurodegenerative conditions v.
		Non-neurological control			Degenerative neurological control			Non-degenerative neurological control			Non-neurodegenerative control
Univariate logistic regression model
Predictor		OR	95% CI	P value	OR	95% CI	P value	OR	95% CI	P value	OR	95% CI	P value
HO-1 (ng/ml)		1.01	1.00−1.03	.02	1	0.98−1.01	.63	1.03	1.01−1.04	<.01	1.02	1.01−1.03	<.01
Multivariate logistic regression model
Predictor		OR	95% CI	P value	OR	95% CI	P value	OR	95% CI	P value	OR	95% CI	P value
HO-1 (ng/ml)		1.02	1.00−1.03	.01	1.00	0.97−1.02	.75	1.04	1.01−1.07	<.01	1.02	1.01−1.03	<.01
Total protein (mg/ml)		1.56	1.27−1.97	<.01	1.25	0.94−1.70	.13	1.34	0.97−1.93	.10	1.39	1.15−1.68	<.01
Age (per year)		1.06	1.03−1.10	<.01	0.89	0.82−0.94	<.01	1.08	1.03−1.15	<.01	1.11	1.08−1.15	<.01
Sex	Female	1	(reference)		1	(reference)		1	(reference)		1	(reference)
	Male	6.45	2.94−15.24	<.01	10.45	3.36−38.14	<.01	15.35	4.27−69.09	<.01	3.27	1.75−6.25	<.01
Arthritis	No	1	(reference)		1	(reference)		1	(reference)		1	(reference)
	Yes	1.15	0.52−2.52	.73	2.91	1.01−9.16	.06	1.00	0.28−3.78	1.00	0.87	0.45−1.66	.66
Thyroid condition	No	1	(reference)		1	(reference)		1	(reference)		1	(reference)
	Yes	2.02	0.77−5.38	.16	14.31	2.91−95.60	<.01	1.75	0.40−8.75	.47	0.87	0.39−1.92	.73
Cardiac condition	No	1	(reference)		1	(reference)		1	(reference)		1	(reference)
	Yes	1.89	0.65−5.56	.24	0.99	0.28−3.68	.99	1.19	0.24−7.29	.84	2.57	1.10−6.24	.03
Diabetes	No	1	(reference)		1	(reference)		1	(reference)		1	(reference)
	Yes	0.21	0.05−0.73	.02	0.08	0.01−0.39	<.01	0.54	0.05−5.70	.61	0.62	0.23−1.60	.33

Abbreviations: OR, odds ratio; 95% CI, 95% confidence interval.