The findings, which provide one of the first national snapshots of urinary incontinence in men, may help improve doctors' ability to identify men who are suffering from the condition, says study head Alayne D. Markland, DO, MS, of the University of Alabama at Birmingham.
Put simply, UI is uncontrollable leaking of urine from the bladder.
Overall, 4.5% of American men suffer from moderate to severe urinary incontinence, which corresponds to having leakage at least once a month, the study shows.
"It's enough to potentially interfere with their quality of life," Markland tells WebMD.
The rate increases with age, from 0.7% in men ages 20 to 34 to 16% in men age 75 and older, the study showed.
The findings were presented at the annual meeting of the American Urological Association.
Studies suggest urinary incontinence is less common among men than women, but there is a paucity of data on UI rates and risk factors in men, Markland tells WebMD.
So she and colleagues analyzed data from 5,297 men aged 20 and older who participated in the National Health and Nutrition Examination Survey, a nationally representative survey of the U.S. population.
Men were interviewed in their homes, and UI was assessed using the 12-point Incontinence Severity Index in which participants are asked if they leak and if so, how much and how often. Moderate to severe UI was defined as a score of 3 or higher.
Among all the men, major depression and hypertension were associated with a 2.6-fold and a 30% increased risk of moderate to severe UI, respectively.
Each 10-year increase in age was associated with an 80% increased risk.
Among the 3,010 men aged 40 and older, enlarged prostate -- called benign prostatic hyperplasia (BPH) -- was associated with a 20% greater chance of having moderate to severe UI.
The rate of moderate to severe UI did not differ by race or ethnicity.
A total of 49% of the men had what is known as urge urinary incontinence, in which you feel like you have to go but can't get to the bathroom in time, Markland says. Thirteen percent had stress urinary incontinence, which occurs when an activity, such as coughing or sneezing, causes a small amount of urine to leak. The rest had a combination.
BPH a Known Cause of Urinary Incontinence
BPH is a well-known cause of UI, says Ira Sharlip, MD, clinical professor of urology at the University of California, San Francisco.
Nightly bathroom runs may be the first sign of an enlarged prostate, he tells WebMD. Other symptoms may include trouble starting a stream of urine, leaking, or dribbling, says Sharlip, who was not involved with the study.