Table 2.

Mean serum protein carbonyl levels among cases and controls stratified by select variables

VariablesControlsCases
nProtein carbonyls (nmol/mL)P*nProtein carbonyls (nmol/mL)P*
Mean (SD)Mean (SD)
Age (y)
    <6383119.84 (3.77)0.8080019.64 (3.88)0.09
    ≥6397419.79 (3.71)1,00819.98 (4.76)
Fruit intake (servings/d)
    <156119.51 (3.74)0.0153019.50 (3.33)0.13
    1 to <258120.18 (3.78)57020.03 (5.83)
    2+47319.62 (3.71)45719.64 (3.73)
Vegetable intake (servings/d)
    <121119.78 (3.84)0.1020019.20 (3.48)0.25
    1 to <259519.89 (3.71)56219.71 (4.09)
    2 to <342820.01 (3.83)44119.79 (3.56)
    3+38119.38 (3.67)35420.00 (6.33)
BMI
    Normal (BMI <25)44919.79 (3.86)0.2849919.79 (3.69)0.97
    Overweight (BMI 25 to <30)94419.92 (3.77)91719.85 (5.01)
    Obese (BMI 30+)39419.57 (3.55)37619.82 (3.62)
Alcohol intake (g/d)
    041519.69 (3.72)0.7541019.85 (3.42)0.95
    >0 to <301,23619.85 (3.73)1,23219.81 (3.84)
    30+15419.84 (3.83)16619.93 (8.51)
Smoking
    Never61919.90 (3.87)0.6364419.66 (3.56)0.29
    Former1,04719.80 (3.69)1,04119.87 (4.93)
    Current13919.57 (3.52)12320.31 (3.42)
Physical activity
    Sedentary31419.80 (3.66)0.9731019.72 (3.55)0.58
    Light74219.85 (3.69)74819.89 (3.84)
    Moderate55319.84 (3.80)59319.91 (5.51)
    Active18819.71 (3.83)15019.40 (3.57)
Gleason grade
    <71,23519.73 (3.74)0.31
    7+49519.97 (5.77)
Treatment arm
    Placebo1,04019.82 (3.79)0.931,04419.73 (3.87)0.27
    Finasteride76519.80 (3.67)76419.97 (5.02)
  • *For factors with two levels, P values were based on a two-sided t test comparing mean protein values between levels; for factors with three or more levels, P values were based on a homogeneity of variance F test.