Table 2.

The comparison of IMR and MCE parameters among the three groups ($\overline{\text{x}}\pm \text{s}$)

Index	Group 1 (n = 20)	Group 2 (n = 18)	Group 3 (n = 18)
A value (dB)	7.56 ± 2.35	6.52 ± 3.01*	4.61 ± 2.08*#
β value (/s)	1.44 ± 0.45	1.21 ± 0.58*	0.84 ± 0.39*#
A × β value (dB/s)	11.72 ± 7.79	8.59 ± 6.33*	4.54 ± 3.88*#
IMR (U)	12.77 ± 4.35	31.01 ± 5.23	75.28 ± 23.83

IMR microcirculation resistance index, MCE myocardial contrast echocardiography

*Compared with Group 1, there were statistically significant differences, p < 0.05

^#Compared with Group 2, there were statistically significant differences, p < 0.05