3.3.2. Duration of hyperventilation 2A significant Group Hyperventilation 2 Duration interaction(z ¼ 2.72, p ¼ .01, R22 ¼ .07; see Fig. 2) indicated that individuals who demonstrated greater behavioral avoidance (shorter duration) had better outcomes in ACT than CBT (significant effect at 1 SD;b ¼ 5.04, CI ¼ 9.85 to .22; p ¼ .04). Group differences at themean and max (180 s) of Hyperventilation 2 Duration were non- significant (ps > .09). Longer duration of Hyperventilation 2 wasassociated with better outcome within CBT (b ¼ .03, CI ¼ .06to .003; p ¼ .03) and worse outcome within ACT (b ¼ .04,CI ¼ .002 to .08; p ¼ .06).