Statistical analysis
Continuous normally distributed data are expressed as means SDs. Within each treatment group (ie, either dark or white chocolate), changes in blood pressure and metabolic indexes from baseline values were analyzed by paired Student’st test. For multiple comparisons, data were analyzed with a two-factor repeated-measures analysis of variance (ANOVA) with time and treatment as the 2 factors. Post hoc comparisons were performed by Tukey’s honestly significant difference test. Statistical analysis and power calculation were performed with a personal computer and with SAS statistical software (version 8.12, 2000; SAS Institute Inc, Cary, NC).