2.8. Statistical Analysis
USA).The, USA).Conventional milk, abdominal pain
The volume of both kinds of milk in the stomach during the two-hour study was compared using two-way repeated measures ANOVA. The normality of the data was tested using Shapiro–Wilk. Log transformation was used to bring the data into a normal distribution. This analysis was conducted using RStudio (v2022.07.2+576.pro12 Spotted Wakerobin, Posit, Boston, MA, USA).The statistical difference between the volume of conventional and A2 milk at each time point was analyzed with the paired Wilcoxon signed-rank test was used to compare the symptom scores. A non-parametric test was used since the symptom scores were ordinal data rated using a Likert scale and they were not normally distributed. The analysis for abdominal pain was conducted using Statistical Package for the Social Sciences (IBM SPSS Statistics for Windows, Version 28.0; IBM Corp., Armonk, NY, USA).Conventional milk was compared with A2 milk by measuring the volume of milk at different time points for gastric transit and with symptom scores for abdominal pain. The volume of milk was converted from millimeter cubed (mm