Table 5.

Saliva sample collection rates among smoking cessation clinical trial participants by last in-person visit in the pre–COVID-19 cohort (n=51).

Matching in-person visita	n	On-site saliva sample collection, samples/visits completed (%)						Saliva sample collection rate (%)
		Visit #2	Visit #3	Visit #4	Visit #5	Visit #6
Visit #1	11	11/11 (100)	11/11 (100)	10/10 (100)	10/10 (100)	8/8 (100)	100
Visit #2	9	N/Ab	7/7 (100)	7/7 (100)	7/7 (100)	7/7 (100)	100
Visit #3	14	N/A	N/A	14/14 (100)	14/14 (100)	13/13 (100)	100
Visit #4	7	N/A	N/A	N/A	6/6 (100)	6/6 (100)	100
Visit #5	10	N/A	N/A	N/A	N/A	10/10 (100)	100
Total	51	11/11 (100)	18/18 (100)	31/31 (100)	37/37 (100)	44/44 (100)	100c

^aMatching: on-site visit during a similar period in 2018 and 2019.

^bN/A: not applicable.

^c95% CI 97.4%-100%.