Nonlinear Relationship Between Age and Likelihood of Undergoing Prostate-Specific Antigen Testing, and the Predictive...

To investigate the nonlinear relationship between age and the likelihood of undergoing prostate-specific antigen (PSA) testing, and the difference of factors influencing the test likelihood among subjects aged 40-54, 55-69, and ≥70 years.

Data were extracted from the 2018 Behavioral Risk Factor Surveillance System, with the primary outcome defined as receipt of a PSA test within the previous 12 months. Restricted cubic splines were used to assess the relationship between age and the likelihood of undergoing PSA testing. Backward conditional logistic regression analyses were used to identify the predictors of undergoing PSA testing among subjects aged 40-54, 55-69, and ≥70 years.

Finally, 92,177 people were identified. The likelihood of PSA testing increased up to around 71 years old and then decreased rapidly for higher ages, showing a clear nonlinear inverted U-shaped relationship with age (p < .001). Insurance status, shared decision-making, whether a recommendation for PSA testing had been accepted, income level, smoking status, and age were the common predictors of testing in the three age groups. However, the predictors differed somewhat among the three groups: being overweight or obese was only positively associated with increased testing among people aged 40-54 and ≥70 years, being retired only greatly impacted the test likelihood among those aged 40-54 years, and the general health status, marital status, and race affected people aged ≥55 years.

The factors influencing PSA screening differ with age, which should be fully considered when screening different target age groups.