Table 2.

ECV for HHD and healthy control groups

	HHD(n = 62)			Controls (n = 26)	P value
	EF < 30% (n = 22)	30%≦EF < 50% (n = 18)	EF≧50 (n = 22)
Mean	0.28 ± 0.03	0.27 ± 0.03	0.27 ± 0.03	0.24 ± 0.02	< 0.05a b c
Base	0.30 (0.06)	0.29 (0.07)	0.28 (0.07)	0.23 (0.03)	< 0.01a b c
Middle	0.29 ± 0.05	0.29 ± 0.05	0.28 ± 0.03	0.24 ± 0.02	< 0.05a b c
Apex	0.25 (0.00)	0.25 (0.01)	0.25 (0.01)	0.25 (0.04)	0.992

Abbreviations: ^a EF < 30% compared with Controls; ^b 30%≦EF < 50% compared with Controls; ^c EF≧50 compared with Controls; ^d EF < 30% compared with 30%≦EF < 50%; ^e EF < 30% compared with EF≧50; ^f 30%≦EF < 50% compared with EF≧50