Table 3.

Baseline and 12-mo prolactin geometric means for exercisers, stratified by change in fitness as measured by VO2max versus controls

NProlactin (ng/mL), geometric mean (95% CI)Change from baselineP*
Controls
    Baseline867.47 (6.78-8.24)
    12 mo857.77 (7.12-8.48)+0.30Ref.
Exercisers
    Gained <5% VO2max
        Baseline236.64 (5.66-7.78)
        12 mo236.99 (6.14-7.96)+0.350.96
    Gained 5-15% VO2max
        Baseline236.99 (5.71-8.55)
        12 mo246.23 (5.35-7.26)−0.760.03
    Gained >15% VO2max
        Baseline286.86 (5.95-7.92)
        12 mo286.39 (5.32-7.66)−0.470.01
P value for trend across change in fitness0.07
  • * P value compares the change in prolactin concentrations between baseline and 12 mo among exercisers, stratified by change in fitness level, to the same change in controls.