sentence: Differences between two categorical groups ( ctrl / SD and day / night / subjective day , EtOH / melatonin and pre - / post-treatment , day / night and aanat2 + / + / aanat2 − / − or day / night and Lap2 β + / Lap2 β − ) on continuous variables ( chromosome dynamics , sleep , or γ H2AX foci number ) were determined by two-way ANOVA using Statistica software ( TIBCO ) .