2.7. Statistical analysis
Statistical treatment of data was performed by means of SPSS Win 12.0 program (SPSS Inc. Chicago, IL, USA). Data were analyzed by ANOVA using a general linear model (GLM). Analysis of variance with cheese age as main effect was performed on analytical variables, and comparison of means was carried out by Tukey's test. Principal component analysis (PCA) with Varimax rotation was carried out on volatile compounds.