Fig 1.
Study visit timeline.
Fig 2.
REST Environments utilized in the current study.
Pictured from left to right: Chair-REST, Pool-REST in an open pool, and Pool-REST in an enclosed pool. Middle panel of Fig 2 is similar but not identical the original image used in Fig 2 of [10], and is provided to illustrate the different REST environments.
Fig 3.
Note. C = Completed. W = Withdrew.
Table 1.
Participant demographics, DSM-5 diagnostic comorbidities, and screening scores at study entry.
Fig 4.
Pre-Treatment credibility beliefs and expectations for symptom improvement.
Note. Figures reflect pre-intervention ratings for credibility of beliefs (top) and expectations for symptom improvement (bottom) on the Credibility and Expectancy Questionnaire, according to the assigned intervention. The black dots and error bars represent the mean and standard error of the mean, respectively. Grey dashed lines reflect an established mean for credibility and expectancy beliefs of other non-pharmacological treatments (e.g., psychotherapy, see discussion). There were no significant group differences in levels of pre-treatment credibility or expectancy beliefs (ps >.05).
Fig 5.
Dropout progression by REST condition.
Drop-out percentages at each time point were derived as follows: (number of subjects who withdrew from the study or who were lost to follow-up)/25.
Fig 6.
Note. Data reflects mean and standard error of session durations for each visit by REST condition, as well as individual session durations (individual data points) depicted in lighter shades. Session durations were significantly longer for the pool-REST preferred condition (M = 75.4 minutes, SD = 29.4) than either the chair-REST (M = 58.4 minutes, SD = 4.3, p = .0003, d = .810, 95% CI [-30.42, -4.75]) or pool-REST condition (M = 53.0 minutes, SD = 12.3; p = .003, d = .996, 95% CI [-36.98, -10.77]). There were no statistically significant differences in session duration between the chair-REST and pool-REST conditions, which had prescribed session durations of 60 minutes (p = .23, 95% CI [-6.44, 19.02]). Duration did not vary as a function of session number.
Fig 7.
Note. Data reflects mean and standard error of magnitude ratings for each event by REST condition. Event anchors ranged from “Extremely Negative” to “Extremely Positive” (anchors not shown). Asterisk (*) indicates significant group difference in rating magnitude.