Table 3. T-test results comparing pre and post-test assessments of a mHealth intervention for pre-exposure prophylaxis adherence by young adult MSM, 2019, United States.

	Pre			Post		t-test
	Mean	Standard deviation		Mean	Standard deviation
Perfect adherence ratea	0.39	0.49		0.72	0.45	<0.001*
PrEP knowledge	6.88	0.90		6.91	0.94	0.784
PrEP treatment self-efficacy	65.92	14.16		70.65	13.60	0.004*
Intention to practice safe sex	2.82	0.83		3.05	0.81	0.003*

a, perfect adherence rate is the percentage of participants who reported ‘no’ to all questions in the PrEP adherence scale. *, P level is less than 0.05.