“…TT and eFT deficiency (defined as blood levels ≤ 10 th percentile in a population of healthy men of the same age) was found in 39%, 17%, 13%, and 27% (TT), and 62%, 22%, 17%, and 36% (eFT) of men with HF aged ≤ 45, 46-55, 56-65, and ≥ 66 years, respectively [35]. Most recent data from our centre indicate that in a group of 382 men with systolic HF treated according to the current standards, TT and eFT deficiency (defined as blood levels ≤ 10 th percentile in a population of healthy men of the same age) was found in 23% and 30% of men with HF aged < 60 years, and 23% and 34% of men aged ≥ 60 years, respectively [110]. Similar rates of testosterone deficiency in HF were reported by other authors [111].…”