Furthermore , segmental ejection fraction in injected scar segments improved to a greater degree in patients with baseline segmental ejection fraction < 20 % ( 12.1 1.2-19 .9 2.7 % ; n = 18 ; P = 0.003 ) , versus < 20 % ( 31.7 3.4-35 .5 3.3 % ; n = 12 ; P = 0.33 , between-group comparison P < 0.0001 ) .