Figure 2. Mean percentage (+/-SE) of anesthesiologists' patients who received at least one preventive measure at each time period (for female patients, there were 23 anesthesiologists at the study hospital and 24 anesthesiologists at the control hospital; for male patients, there were 16 anesthesiologists at the study hospital, and 21 at the control hospital). *Significantly different from baseline period, P < 0.05.