Table 7.

Generalized estimating equations results testing intervention effect on optimal sleep

	Model 5A					Model 5B
	Coefficient B	SE	Wald	95% LL	95% UL	Coefficient B	SE	Wald	95% LL	95% UL
Intercept	0.08	0.39	0.04	− 0.69	0.85	0.57	0.43	1.77	− 0.27	1.40
Sophomorea	0.94	0.59	2.55	− 0.21	2.08	1.10	0.61	3.33ϯ	− 0.08	2.29
Juniora	0.11	0.40	0.07	− 0.67	0.88	− 0.01	0.41	0.00	− 0.82	0.80
Sex (male)	0.08	0.50	0.02	− 0.90	1.06	0.04	0.49	0.01	− 0.92	1.00
Neuroticism	0.09	0.24	0.15	− 0.38	0.57	0.05	0.22	0.05	− 0.39	0.49
Trait mindfulness	0.32	0.26	1.47	− 0.20	0.84	0.41	0.27	2.31	− 0.12	0.94
Coronavirus worry	− 0.04	0.19	0.04	− 0.41	0.33	− 0.08	0.19	0.18	− 0.45	0.29
Time	0.13	0.08	2.66	− 0.03	0.28	− 0.16	0.09	3.38ϯ	− 0.32	0.01
Intervention	0.28	0.36	0.59	− 0.43	0.99	− 0.16	0.42	0.15	− 0.99	0.67
Intervention × time						0.32	0.13	5.75*	0.06	0.58
QIC goodness of fit	364.2

N = 64 (between subjects) and N = 268 (within subjects). LL/UL, lower/upper confidence interval limit

B, generalized estimation coefficient; SE, standard error

Model 5A does not include the time × intervention coefficient, whereas Model 5B does

^aReference group = senior

^*p < .05; **p < .01; ϯp < .10