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. 2019 Dec 5;21(12):e15836. doi: 10.2196/15836

Table 3.

Generalized estimating equation analysis of the effect of the intervention on overall defined daily dose.

Variable	Regression coefficient	SE	χ² (df)	P value
Group (intervention)^a	–0.242	0.16	2.5 (1)	.12
Time (3 mo)^b	0.132	0.47	8.1 (1)	.004
Time (6 mo)^b	0.132	0.05	6.9 (1)	.008
Group (intervention) × time (3 mo)^c	–0.202	0.07	8.9 (1)	.003
Group (intervention) × time (6 mo)^c	–0.236	0.07	11.3 (1)	.001

^aReference group: control group.

^bReference group: time (baseline).

^cReference group: group (control) × time (baseline).