INS and diabetes mellitus: After propensity score matching, gender (P=.61), age (P=.38), education level (P=.54), duration of diabetes (P=.49), insulin regimen (P=.47), fasting blood glucose (P=.51), postprandial blood glucose (P=.34), self-monitoring of blood glucose frequency (P=.75), and the number of diabetes education courses completed (P=.44) showed no significant differences at baseline between the 2 groups, and the standardized mean differences were <10.0% for all variables, indicating a good balance between the 2 groups at baseline (see Table 2).