As presented in Supplementary Table 5 , further ITS revealed that post-NVBP policy implementation, the immediate change in the DDDs of NVBP antimicrobial agents did not reach statistical significance ( β 2 = −1.806 units, p = 0.058) but subsequently exhibited a significant upward trend ( β 3 = 0.135 units/month, p = 0.017); the proportion of DDDs for NVBP antimicrobial agents exhibited a significant immediate decrease ( β 2 = −15.464 units, p = 0.009) and a significant upward trend ( β 3 = 1.400 units/month, p < 0.001).
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Impact of national volume-based procurement on physicians' antimicrobial prescribing behaviours: an interrupted time series analysis of 1200 prescriptions in a tertiary hospital.
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