Data management: preparing to analyse the data -- Continuous variables: descriptive statistics -- Continuous variables: comparing two independent samples -- Continuous variables: paired and one-sample t-tests -- Continuous variables: analysis of variance -- Continuous data analyses: correlation and regression -- Categorical variables: rates and proportions -- Categorical variables: risk statistics -- Categorical and continuous variables: tests of agreement -- Categorical and continuous variables: diagnostic statistics -- Categorical and continuous variables: survival analyses.