Table 2.

Between-Person (14-Day Average) Correlations Among Key Study Variables

Variable	1	2	3	4	5	6	7
1. Shift worker status
2. Actigraphy total sleep time	−.22**
	[−.31, −.12]
3. Actigraphy sleep efficiency	−.11*	.41**
	[−.21, −.01]	[.32, .49]
4. Self-report total sleep time	−.25**	.81**	.10*
	[−.34, −.16]	[.77, .84]	[.00, .20]
5. Self-report sleep efficiency	−.23**	.09	.33**	.32**
	[−.33, −.14]	[−.01, .19]	[.24, .42]	[.23, .41]
6. Daily stress	−.07	.04	.03	−.07	−.20**
	[−.16, .03]	[−.06, .14]	[−.07, .13]	[−.17, .03]	[−.29, −.10]
7. Gender	−.06	.15**	.12*	.10	−.01	.07
	[−.16, .04]	[.05, .25]	[.02, .22]	[−.00, .20]	[−.11, .09]	[−.03, .17]
8. Age	−.18**	−.09	.15**	−.20**	−.06	.05	.07
	[−.28, −.08]	[−.19, .01]	[.05, .24]	[−.29, −.10]	[−.16, .04]	[−.05, .15]	[−.03, .17]

Note. Values in square brackets indicate the 95% confidence interval for each correlation. The confidence interval is a plausible range of population correlations that could have caused the sample correlation.

^*indicates p < .05.

^**indicates p < .01.

Gender is coded as 0 = male, 1 = female. Shift worker status is coded as 0 = day worker (did not work any shifts between 9pm and 6am in the past two weeks), 1 = night shift worker (worked at least one shift between 9pm and 6am in the past two weeks).