TABLE 3.

Multivariate analysis of differences in instrumental parameters among groups

	ET vs HC		ET vs PD
OCT Parameters	AdjOR* (95% CI)	P	AdjOR* (95% CI)	P
RNFL (µm)	0.51 (0.33–0.78)	0.002	3.17 (1.74–5.77)	<0.001
GCL (µm)	0.49 (0.33–0.74)	0.001	1.30 (1.04–1.60)	0.017
IPL (µm)	0.82 (0.63–1.07)	0.153	1.40 (1.08–1.82)	0.010
INL (µm)	0.84 (0.72–0.98)	0.031	1.15 (1.00–1.31)	0.042
OPL (µm)	0.88 (0.75–1.02)	0.104	1.00 (0.91–1.10)	0.998
ONL (µm)	0.92 (0.85–0.99)	0.038	1.03 (0.98–1.08)	0.284
RPE (µm)	0.91 (0.61–1.36)	0.641	1.06 (0.72–1.54)	0.771
pRNFL (µm)	0.96 (0.87–1.03)	0.261	1.05 (0.99–1.11)	0.128
pRNFL superior (µm)	0.95 (0.89–1.02)	0.206	1.02 (0.98–1.06)	0.338
pRNFL temporal (µm)	0.88 (0.81–0.97)	0.007	1.03 (0.96–1.10)	0.441
pRNFL inferior (µm)	0.99 (0.93–1.05)	0.736	1.00 (0.95–1.04)	0.820
pRNFL nasal (µm)	0.96 (0.89–1.03)	0.285	1.06 (1.00–1.13)	0.052

In bold: P < 0.05.

^*Adjusted OR by age, sex, and hypertension.

ET, essential tremor; GCL, ganglion cell layer; HC, healthy controls; INL, inner nuclear layer; IPL, inner plexiform layer; ONL, outer nuclear layer; OPL, outer plexiform layer; PD, Parkinson disease; pRNFL, peripapillary RNFL; RNFL, retinal nerve fiber layer; RPE, retinal pigment epithelium.