Table 2.

Daily sunburns and UV-B dose experienced by participants and mean proportion of each day spent outside by all participants during the 3 periods (days 0-7, days 8-17, and days 18-28).

Variables			Days 0-7	Days 8-17	Days 18-28	P valuea
Population, n			42	42	42	N/Ab
Individual participants
	Number of sunburns, n (%)						.55
		0	24 (57)	27 (64)	25 (59)
		1	12 (29)	8 (19)	8 (19)
		2	4 (10)	5 (12)	6 (14)
		More than 2	2 (5)	2 (5)	3 (7)
	UV-B daily dose (J/m2), mean (SD)c		91.96 (115.34)	74.97 (82.32)	62.73 (71.44)	.08
Sample
	Proportion of each day spent outside, mean (SD)		0.87 (0.19)	0.84 (0.21)	0.81 (0.24)	.05
		6-7:59 AM	0.15 (0.25)	0.14 (0.20)	0.14 (0.21)	.93
		8-9:59 AM	0.19 (0.21)	0.18 (0.20)	0.18 (0.22)	.93
		10-11:59 AM	0.33 (0.28)	0.31 (0.23)	0.31 (0.22)	.74
		Noon-1:59 PM	0.43 (0.29)	0.41 (0.22)	0.36 (0.24)	.20
		2-3:59 PM	0.44 (0.26)	0.37 (0.19)	0.39 (0.25)	.24
		4-5:59 PM	0.47 (0.27)	0.45 (0.30)	0.48 (0.28)	.67

^aP values are from the main effects of time from repeated measures general linear models (log or identity link).

^bN/A: not applicable.

^cThe UV device malfunctioned for 1 person; thus, the participant’s data were removed.