TABLE 2.

Studies of IPT for panic disorder

Study	Design	IPT	Adaptation	Outcome	Remarks and effect sizes
Lipsitz et al.[42]	Open trial N = 12	14 weekly sessions	Minimal	75% response (PDSS, CGI) Attrition: 17%	ES:PDSS d = 1.50
Vos et al.[44]	RCT: IPT vs. CBT N = 91	12 weekly sessions	None	CBT > IPT (panic frequency, behavioral test) Attrition: IPT 21%, CBT 31%	9-year study, 17 therapists in crossed therapist design; idiosyncratic outcomes 1-month f/u assessment. ES: panic attack frequency (IPT) d = 0.51

CBT, cognitive behavioral therapy; CGI, Clinical Global Improvement Scale; ES, effect size (Cohen's d); f/u, follow-up; IPT, interpersonal psychotherapy; PDSS, Panic Disorder Severity Scale; RCT, randomized controlled trial.