New research study shows that one in five American men in their 40s had a PSA test in the past year, and the results for screening rates in black men are still “discouraging,” investigators said.

Overall, about 20% of all men ages 40 to 49 had had PSA evaluations within the previous year, according to the study. Black men were more than twice as likely to have been screened as men in the general population. The study found that 53.7% of men ages 50 and older had PSA testing within the past year.

“Our findings for black men are discouraging,” senior investigator Dr. Judd W. Moul from Duke University in Durham, North Carolina, said in a statement, according to Reuters. “We’ve been encouraging black men to get screened at age 40 or 45 for more than a decade, yet only one-third of these high-risk men reported being tested.”

The authors of the study emphasized the need for early detection which is more important in higher risk groups, such as those with a family history of prostate cancer.

While the American Cancer Society and the American Urological Association recommend annual PSA screening for prostate cancer in men ages 50 and older, recent studies suggest that the screening test may not be accurate for men age 75 and older and the treatment is less likely to be effective for them.

The prostate cancer process develops very slowly and such unnecessary test could make it develop faster than it should. PSA tests aren’t precisely enough to diagnose the cancer and they may lead to useless surgical biopsies which could determine other complications.