Table 5.

Light-adapted 3.0 flicker ERG (28.3 Hz) measurements recorded from patients with cognitive impairment in comparison with the normative data of the RETeval system.

Light Adapted Test (flicker cone–3.0 cd.s/m2, 30 cd/m2, 28.3 Hz)	ERG reference data n = 244 median [90% CI] Age: [76 – 86]	Cognitive Impairment Cases n = 20 median [90% CI] Age: [69 – 90]	Cognitively Healthy Cases n = 19 median [90% CI] Age: [60 – 88]	p-value
Amplitude(μV)	2.5% limit 19.6 [18–22.1] 97.5% limit 39.4 [35.5–43.1]	12.6 [10.9 – 14.4]	37.4 [36.6 – 38.2]	<0.001∗∗
Implicit Time(ms)	2.5% limit 25.6 [25.1–26.3] 97.5% limit 29.6 [29.2–29.9]	31.2 [29.6–32.8]	29.6 [29.4 –29.8]	<0.001∗∗

Amplitude (μV) and implicit time (ms) are denoted along with the medians and 90% confidence intervals of the 2.5 and 97.5% reference limits. The P-values comparing cognitive impairment vs. cognitively healthy cases were calculated by independent sample t test. ^∗∗Significant (p < 0.01).