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The condition has a low prevalence, estimated as being between 1 in 4,000 and 1 in 10,000 for male HH cases overall and 1 in 50,000 for Kallmann syndrome. It is three to five times more common in males than females. Though whether this is a true sex imbalance or a reflection on how difficult KS / HH is to diagnose correctly, especially in females, has yet to be fully established. Finnish population at 1 in 48,000, with a sex distinction of 1 in 30,000 for males and 1 in 125,000 for females.