Fig. 2From: Construction and application of a nursing human resource allocation model based on the case mix indexThe curvefit between DNW and CMI. Note: DNW, daily nursing hours. CMI, Case Mix Index. A quadratic equation can establish the best quantitative relationship between DNW and CMI, with optimal goodness of fit R2 = 0.627, and credible regression coefficients (quadratic coefficient: t = 2.552, P = 0.011; monomial coefficient: t = 2.141, P = 0.033)Back to article page