Table 1: Characteristics of prostate cancer cases by race.

CharacteristicAfrican Americans European Americans Difference testing

MeanSDMeanSD
Mean age (years)61.97.864.17.80.7426
% %

Site0.6391
 Louisiana45248.647247.5
 North Carolina47851.452152.5
Prostate cancer aggressivenessa<0.0001
 Low43146.355656.0
 Intermediate31333.728728.9
 High18620.015015.1
Tumor stage0.0845
 T150754.554755.1
 T238941.842142.4
 T3-T4161.7141.4
 Missing181.9111.1
Categorized sum of Gleason score0.019
 ≥8 or 7 with (4 + 3) pattern20121.717317.5
 <7 or 7 with (3 + 4) pattern72478.381782.5
Education level<0.0001
 Graduate school/prof.degree646.921621.7
 Some college/college grad27029.141241.5
 High school grad/vo-tec30833.126927.1
 <8th grade/some high school28730.9969.7
Smoking status<0.0001
 Never18419.8949.4
 Former45348.753253.6
 Current29331.536737.0
Level of physical activityb<0.0001
 Vigorous41244.356056.4
 Moderate26528.526326.5
 No/Light24726.616917.0
 Missing60.610.1
Use of nutritional supplements<0.0001
 None31033.353754.1
 1–4 days/week525.6626.2
 5+ days/week56861.139439.7
Use of NSAIDs<0.0001
 Yes40843.966667.1
 No51355.132532.7
 Missing90.920.2
Multivitamin supplementation<0.0001
 No60565.145846.1
 Yes32534.953553.9
Family history (first degree relative affected)0.1561
 No68874.076276.7
 Yes24226.023123.3
Screening history (PSA or DRE)<0.0001
 No20722.311311.3
 Yes72377.788088.7
Body mass index (weight (kg)/height (m2))0.001
 Under weight (<18.0)91.030.3
 Normal weight (18.0–<25.0)18019.615415.6
 Over weight (25.0–<30.0)35738.946146.7
 Obese (30.0–<40.0)32535.433534.0
 Highly obese (≥40.0)475.1333.4

aProstate cancer aggressiveness is defined as the severity of the cancer at diagnosis based on combinations of the Gleason score, morphologic stage, and PSA as follows: high aggressive: Gleason sum ≥ 8 OR PSA > 20 ng/mL OR Gleason sum ≥ 7 and stage T3c-T4c; low aggressive: Gleason sum < 7 and stage T1c-T2c and PSA < 10 ng/mL; intermediate aggressive: all other cases.
bPhysical activity categories defined by MET-hrs/week as follows: vigorous: >17MET-hrs/week; moderate: >6.5 to ≤17 MET-hrs/week; and no/light: 0 to ≤6.5 MET-hrs/week.