We tested homogeneity of variances (Levene’s test, p < 0.05) to obtain
a single p-value that indicated the presence or absence of variability
in energy and salt content across food categories and fast food
chains. Due to the variance observed, we used the Welch ANOVA
for comparison of means of unequal variances (p < 0.05). We used
one-way analysis of variance to compare salt content between companies,
using Tukey–Kramer test HSD. A p value ≤0.05was considered
statistically significant. All statistical analyses were performed using
SPSS version 20.