. 2012 Nov 22;15(6):1122–1129. doi: 10.1093/ntr/nts252

Table 2.

Odds of Attributing Lapse to a Situational Factor

Variable		PTSD	Control	Chi-square	Phi coefficient
Location	Yes	14	8	= 1.311	φ = 0.136
Location	No	24	25	= 1.311	φ = 0.136
Social environment	Yes	12	9	= 0.157	φ = 0.047
Social environment	No	26	24	= 0.157	φ = 0.047
Activity	Yes	13	8	= 1.146	φ = 0.109
Activity	No	25	25	= 1.146	φ = 0.109
Positive affect	Yes	3	4	= 0.355	φ = −0.071
Positive affect	No	35	29	= 0.355	φ = −0.071
Negative affect	Yes	22	8	= 8.198**	φ = 0.340
Negative affect	No	16	25	= 8.198**	φ = 0.340
Trauma reminders	Yes	9	0	Fisher’s p = .003**	n/a
Trauma reminders	No	29	33	Fisher’s p = .003**	n/a
Cravings	Yes	28	17	= 3.740	φ = 0.230
Cravings	No	10	16	= 3.740	φ = 0.230

Note. PTSD = posttraumatic stress disorder. A positive phi coefficient indicates the extent to which that factor was more likely to be cited by individuals with PTSD as a factor in smoking lapse. Due to a cell size <5, a two-tailed Fisher’s exact test was calculated for the trauma reminders outcome.

*p < .05. **p < .01.