Figure 4.

Comparison of nighttime (PM) and daytime (AM) activity scores across the entire study. Nighttime scores were not significantly different (n.s.) between cages in which all mice underwent surgery (all operated) and those containing mice that had surgery and those that did not (combined). However, daytime scores differed (*, P < 0.05) between combined and all-operated cages, but the magnitude was small, and neither group demonstrated high activity or aggression. As expected, combined night activity was greater than combined day activity (+, P < 0.05).