2.7. Statistical Analysis
REGRESSION
Statistical analyses were conducted using Statistical Package for the Social Sciences (SPSS) for Windows v21.0 (IBM Crop, Armonk, NY, USA) or GraphPad InStat (GraphPad Software, Inc., San Diego, CA, USA) software. A 2 × 2 × 3 general linear model repeated measures ANOVA was used to examine acetylcholinesterase and myeloperoxidase concentrations after caffeine ingestion, with genotype group (TT vs. CT/CC) as between-subjects factor and condition (caffeine vs. placebo) and sampling time (pre, post, and 15 min post) as the within-subjects factor. Multiple regression was used to assess the relationship between coffee intake and 