Table 2.

Unadjusted and adjusted odds of secure messaging among observed months with STI tests orders compared to those without, stratified by history of portal use for secure messaging

	No STI test (GC/CT or HIV) orders	1 or more STI test (GC/CT or HIV) orders	Unadjusted analysis			Adjusted analysis
	N (%)	N (%)	OR	95% CI	p-value**	OR	95% CI	p-value**
1 or more messages sent from patient portal
No	657,070 (98.9)	2,813 (93.9)	1.00	ref		1.00	ref
Yes	7,611 (1.1)	184 (6.1)	5.65	4.80, 6.64		3.54	2.92, 4.30
Messages sent during observed month among first-time portal users					0.000			0.000
No	635,707 (99.5)	2,651 (97.0)	1.00	ref		1.00	ref
Yes	2,978 (0.5)	81 (3.0)	6.52	5.21, 8.17		4.88	3.86, 6.17
Messages sent during observed month among prior portal users
No	21,363 (82.0)	162 (61.1)	1.00	ref		1.00	ref
Yes	4,633 (17.8)	103 (38.9)	2.93	2.25, 3.82		2.53	1.95, 3.29

^**p-value for interaction term

OR=odds ratio; CI=Confidence interval