When patients with acute renal failure or vancomycin exposure within 7days prior to study medication were excluded , clinical cure rates in the < 10g/mL , 10g/mL to < 15g/mL , and15g/mL vancomycin trough level groups ( 71 % [ 12/17 ] , 60 % [ 9/15 ] , and 27 % [ 3/11 ] , respectively ; p = 0.04 ) and the number of deaths ( 12 % [ 2/17 ] , 20 % [ 3/15 ] , and 45 % [ 5/11 ] , respectively ; p = 0.07 ) demonstrated a trend towards worse outcomes in the higher vancomycin trough level groups .