Baseline and 6-week mean ejection fraction was similar for the G-CSF and placebo groups : 34.8 % ( 95 % confidence interval [ CI ] 32.6 % -37.0 % ) v. 36.4 % ( 95 % CI 33.5 % -39.2 % ) at baseline and 39.8 % ( 95 % CI 36.2 % -43.4 % ) v. 43.1 % ( 95 % CI 39.2 % -47.0 % ) at 6 weeks .