Fig. 2

Event-free curves for (a) joint pain and (b) painless joint symptoms for anastrozole vs. letrozole. There was no statistically significant difference in occurrence of joint pain (a, p = 0.139, log-rank test). However, the time to onset of painless joint symptoms was significantly shorter in the anastrozole group than in the letrozole group (b, p = 0.022, log-rank test)