Table 4.

Change in electronic cigarette dependence from baseline to 26 weeks among study participants (adult daily vapers in the United States) who did not report 7-day point-prevalence abstinence at 26 weeks (N=33).

PSECDIa (baseline)	PSECDI (26 weeks), n (%)
	Not dependent	Low dependence	Medium dependence	High dependence	Sum
Not dependent	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)
Low dependence	0 (0)b	1 (3)c	0 (0)	0 (0)	1 (3)
Medium dependence	1 (3)b	5 (15)b	3 (9)c	2 (6)d	11 (33)
High dependence	1 (3)b	1 (3)b	8 (24)b	11 (33)c	21 (64)
Sum	2 (6)	7 (21)	11 (33)	13 (39)	33 (100)

^aPSECDI: Penn State Electronic Cigarette Dependence Index; 10 items (where a score of 0-3 indicates no dependence, a score of 4-8 indicates low independence, a score of 9-12 indicates medium dependence, and a score of ≥13 indicates high dependence).

^bParticipant PSECDI improved from baseline to 26 weeks.

^cParticipant PSECDI did not change from baseline to 26 weeks.

^dParticipant PSECDI worsened from baseline to 26 weeks.