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- Title
Confidence intervals and hypnosis in the Treatment of obesity.
- Authors
Sapp, Marty; Obiakor, Festus E.; Scholze, Steffanie; Gregas, Amanda J.
- Abstract
This study surveys the research on hypnosis and obesity over the past 25 years. Confidence intervals were used to provide upper and lower limits of hypnosis in the treatment of obesity. Previous studies have found mixed results. For example, Levitt (1993) reported an average correlation between weight loss and hypnotic susceptibility of .550, p > .05. A 95% confidence interval around the population correlation coefficient was -.060 for the lower limit and .91 for the upper limit. Allison and Faith (1996) found a point estimate for d of .26 for hypnosis and weight loss (small effect size), and Kirsch (1996) found a point estimate for hypnosis and weight loss of .98 (large effect size). The current study found a 95% confidence interval around the population d of (-.4562, .9549) for the Allison and Faith study, and (-.0440, 1.9449) for the Kirsch study. Point estimates between the two studies did not differ. The current study found that results of Allison and Faith and Kirsch have overlapping confidence intervals. Finally, power values were low for both confidence intervals and more studies are needed to improve statistical power.
- Publication
Australian Journal of Clinical Hypnotherapy & Hypnosis, 2007, Vol 28, Issue 2, p25
- ISSN
0810-0713
- Publication type
Academic Journal