- Symptom question Q8: Have you followed the food and drinks indications of your physician?, measured as a Boolean variable (YES/NO) Sample size was calculated to reduce readmission rate by 10% in 3 months time. Having a significant level of 0.05. Sample: 50-60 per group. With the first 20 patients included, sample size was recalculated, only 40 were needed in each group. However, we included more patients in the intervention (up to 50) to face drops, only 3 dropped the study, so we obtained data from 47 in the intervention group.