Fig. 2From: Comparison of the predictive value of four insulin resistance surrogates for the prevalence of hypertension: a population-based studyBetween-group differences in four IR surrogates at different blood pressure levels. *Indicates Grade I, Grade II and Grade III compared with normal group with p-value < 0.001. **Indicates Grade II and Grade III compared with Grade I with p-value < 0.001. ***Indicates Grade III compared with Grade II with p-value < 0.001. #Indicates Grade III compared with Grade II with p-value < 0.05Back to article page