Table 2. Mean (SDs) for the Within- and Between-Session SUDS Habituation and Between-Session Craving Habituation.

	n	Mean	SD
Average within-session SUDS habituation	46	-16.74	12.37
Average Peak SUDS	46	60.59	20.41
Average Post SUDS	46	43.81	23.41
Early within-session SUDS habituation	46	-22.13	22.83
Early Peak SUDS (first imaginal exposure)	46	80.44	18.37
Early Post SUDS (first imaginal exposure)	46	58.30	27.07
Late within-session SUDS habituation	36	-8.86	13.08
Late Peak SUDS (last imaginal exposure)	36	38.33	23.72
Late Post SUDS (last imaginal exposure)	36	29.47	21.54
Between-session SUDS habituation	36	-40.56	26.51
Between-session craving habituation	34	-15.03	28.98

Note: SUDS = subjective units of distress. Eight participants withdrew from the study prior to session 4. Due to pressing clinical issues, the first imaginal exposure occurred during session 5 for 2 participants and during session 6 for 1 participant. Late within-session SUDS habituation and between-session SUDS habituation ratings were available for all treatment completers (n = 36). The final imaginal exposure session occurred prior to session 11 for 8 treatment completers. In these cases, ratings from the last completed imaginal exposure were used to calculate late within-session and between-session SUDS as well as between-session craving habituation. Craving ratings were not assessed for 2 participants.