Table 4.

Logistic analysis of the association between the CSIT score and olfactory impairment severity with the risk of MCI and AD.

	MCI vs. NC		MCI vs. AD		AD vs. NC
	CSIT score	Olfactory impairment severity	CSIT score	Olfactory impairment severity	CSIT score	Olfactory impairment severity
Model 1 *
OR [95%CI]; P	0.59 [0.50, 0.69], P < 0.001	2.83 [1.92, 4.17], P < 0.001	0.76 [0.67, 0.87]; P < 0.001	1.84 [1.35, 2.52], P < 0.001	0.55 [0.44, 0.67]; P < 0.001	3.69 [2.31, 5.90], P < 0.001
Model 2 *
OR [95%CI]; P	0.62 [0.53, 0.73]; P < 0.001	2.35 [1.58, 3.50]; P < 0.001	0.81 [0.69, 0.95]; P = 0.008	1.55 [1.09, 2.21]; P = 0.015	0.59 [0.47, 0.74]; P < 0.001	2.81 [1.65, 4.77]; P < 0.001
Model 3 *
OR [95%CI]; P	0.61 [0.52, 0.72]; P < 0.001	2.38 [1.59, 3.57]; P < 0.001	0.80 [0.68, 0.93]; P = 0.005	1.61 [1.12, 2.30]; P = 0.010	0.58 [0.45, 0.73]; P < 0.001	2.88 [1.67, 4.97]; P < 0.001

^*Model 1: non-adjusted model.

^*Model 2: adjusted for age, gender, and education levels.

^*Model 3: further adjusted for hypertension, hyperlipidemia, diabetes, CAD, and sleep disorder based on Model 2.