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

Table 5.

Generalized estimating equation analysis of the effect of the intervention on self-rated health status.

Variable	Regression coefficient	SE	χ² (df)	P value
Group (intervention)^a	–11.247	1.89	35.5 (1)	<.001
Time (3 mo)^b	–8.252	1.56	28.1 (1)	<.001
Time (6 mo)^b	–12.820	1.65	60.5 (1)	<.001
Group (intervention) × time (3 mo)^c	24.459	1.92	163.0 (1)	<.001
Group (intervention) × time (6 mo)^c	36.883	2.08	314.4 (1)	<.001

^aReference group: control group.

^bReference group: time (baseline).

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