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

Table 1.

Generalized estimating equation analysis of the effect of the intervention on systolic blood pressure.

Variable	Regression coefficient	SE	χ² (df)	P value
Group (intervention)^a	0.12	1.86	0.004 (1)	.95
Time (3 mo)^b	5.28	1.36	15.2 (1)	<.001
Time (6 mo)^b	7.99	1.44	30.9 (1)	<.001
Group (intervention) × time (3 mo)^c	–21.43	1.89	127.7 (1)	<.001
Group (intervention) × time (6 mo)^c	–27.82	2.10	175.2 (1)	<.001

^aReference group: control group.

^bReference group: time (baseline).

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