The placebo and irbesartan groups were comparable at baseline in terms of sex balance ( 26 vs 30 men ) , mean age ( 62 vs 61 years ) , median HD vintage ( 137 vs 148 days ) , mean HD time ( 10 vs 11h/wk ) , median urine volume ( 1.19 vs 1.26 L/d ) , and mean GFR ( 4.8 vs 5.7 mL/min/1 .73 m ( 2 ) ) .