The record search identified 728 fasting patients and 252 patients who had received a weight reduction diet. 367 of the fasting patients (50.4%) and 75 patients with weight reduction diet (29.8%) met the inclusion and exclusion criteria.
The reasons for the subsequent exclusion of 78 fasting and 28 weight reduction diet patients are shown in Table 1.
122 of the 200 fasting patients (61%) and 47 of the 75 weight reduction diet patients (62.7%) ultimately participated in the phone interview.
The weight reduction diet patients reduced their body weight during the inpatient treatment from 89.7 [+ or -] 14.3 kg to 85.8 [+ or -] 13.5 kg at the end of the therapy.
During inpatient therapy the fasting patients reduced on average significantly more body weight than the weight reduction diet patients (-5.9 [+ or -] 1.9 kg versus -3.9 [+ or -] 1.7 kg, P < 0.001) but increased significant more weight again up to the interview (+6.4 [+ or -] 6.3 kg versus +1.4 [+ or -] 7.7 kg, P < 0.001).
Considering besides the 5% threshold an absolute weight reduction of more than 2.25 kg from baseline body weight as a successful weight loss, 26.2% of the fasting and 55.3% of the weight reduction diet patients fulfilled this criterion, which is a statistically highly significant (P < 0.001) difference between the groups with a small to medium statistical effect (w = 0.28).