The item responses were factor analyzed using the principal component
extraction methods with a varimax rotation using age as a covariate. Factor 1
contained four items: “feel good about being the study”, “diet was easy to
follow”, “have time to follow diet”, “recommend diet to family and friends”.
Factor 2 contained “diet takes more time than usual diet”, “being in the study
was stressful”, and “finishing is like a weight being lifted”. Factor 3 contained
“would recommend diet to family and friends”, “want to keep following the
diet”, and “would like phone calls to minimize appointments”. Data shown
are mean (SD), median (inter-quartile range). Based on the linear regression
analysis, none of these factors were significantly different across the two diet
arms.