Table 2 Time of exposure to different light intensities by day period and age group (elderly participants, n = 44; young participants, n = 44).

Group	Period	<10 lux	10–100 lux	100–1000 lux	1000–10000 lux	>10000 lux
Young	Morning	01:20 ± 00:10^a	02:23 ± 00:08^b	03:15 ± 00:12^c	00:45 ± 00:06^d	00:18 ± 00:03^d
	Evening	02:01 ± 00:11^a†	02:30 ± 00:10^ab	02:53 ± 00:14^b	00:34 ± 00:07^c	00:02 ± 00:07^c
	Night	07:00 ± 00:12^a†‡	00:23 ± 00:04^bc†‡	00:31 ± 00:04^b†‡	00:05 ± 00:02 ^cd†‡	00:00 ± 00:00^d
Elderly	Morning	02:17 ± 00:11^a*	01:56 ± 00:09^a	02:20 ± 00:08^a*	00:59 ± 00:04^b	00:29 ± 00:04^b
	Evening	03:18 ± 00:16^a†*	02:05 ± 00:10^b	02:06 ± 00:14^b*	00:25 ± 00:04^c†	00:06 ± 00:02^c
	Night	07:30 ± 00:11^a†‡*	00:14 ± 00:03^b†‡	00:14 ± 00:02^b†‡*	00:03 ± 00:01^b†	00:00 ± 00:00^b†

Time spent at different light intensities during three time intervals during daytime (morning from 08:00 to 15:50, evening from 16:00 to 23:50 and night from 00:00 to 07:50) for young and elderly participants. All the data are expressed as mean ± SEM (hh:mm). *Indicates statistically significant differences with the young group in the same light intensity and period, ^†Indicates statistically significant differences with morning in the same light intensity and age group, ^‡Indicates statistically significant differences with evening in the same light intensity and age group and different letters indicates statistically significant differences among light intensities in the same time window and age group according to General Linear Model repeated measures controlling for gender with post-hoc Benjamini-Hochberg procedure for multiple comparisons.

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