Conversely , segmental ejection fraction ( a measure of contractile performance ) improved in injected scar segments ( 19.9 3.3-26 .3 3.5 % ; P = 0.003 ) but not in noninjected scar segments ( 21.3 2.6-23 .5 3.2 % ; P = 0.20 ; between-group comparison P < 0.05 ) .