. Author manuscript; available in PMC: 2020 Jun 27.

Published in final edited form as: Behav Sleep Med. 2018 Dec 27;18(2):226–240. doi: 10.1080/15402002.2018.1557189

Table 5.

Prevalence of adverse effects attributed to the lighting conditions reported during weekly telephone assessments by participants who completed one or both study periods.

Adverse effect	Reports/treatment week (percent)		p value^c
Adverse effect	Intervention^a (blue light)	Control^b (red light)	p value^c
Anxiety	6.7	3.4	0.079
Blurred vision	4.8	4.9	0.99
Difficulty concentrating	17.8	13.9	0.25
Difficulty focusing	7.8	6.0	0.40
Eye burning or irritation	13.8	12.4	0.62
Eye redness	11.5	6.4	0.035*
Eyestrain	9.3	7.1	0.35
Headache	19.3	10.5	0.004*
Irritability	20.4	12.4	0.016*
Jitteriness	3.7	3.4	0.82
Nausea	2.6	0.8	0.095
Seeing spots	2.2	4.9	0.10
Skin rash on face	1.5	1.5	0.99

Notes:

^(a)

reports are based on the 35 participants who completed the intervention condition;

^(b)

reports are based on the 38 participants who completed the control condition;

^(c)

based on chi-squared statistic, significant values (p < 0.05) are indicated with an asterisk (*).