Article Figures & Data
Tables
- Table 1
Characteristics of prostate cancer cases and matched controls
Characteristics Cases (n = 249) Controls (n = 249) Two-sided Pa Born in United States (%) 88.4 85.5 0.42 Buddhist/Shinto religion (%) 67.5 68.7 0.79 High school education (%) 57.8 49.8 0.07 Married once (%) 88.3 86.7 0.69 Alcohol use (%) 76.3 75.1 0.83 Mean systolic blood pressure (mm/Hg) 135.7 137.9 0.23 Mean serum cholesterol (mg/dl) 218.3 217.8 0.92 Mean body mass index (kg/m2) 23.8 24.0 0.40 -
a The exact binomial probability test for matched sample was used for comparing proportions; a paired t test was used for comparing means.
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- Table 2
Age-adjusted ORsa and 95% confidence intervals for prostate cancer by cigarette smoking
Cigarette smoking history No. of cases/controls ORs 95% Confidence interval Nonsmoker 87 /98 1.0 Past smoker 86 /83 1.2 0.8–1.8 Current smoker 76 /67 1.3 0.8–2.0 1–30 pack-years 20 /16 1.4 0.7–2.9 >30 pack-years 56 /51 1.2 0.8–2.0 -
a ORs and 95% confidence intervals were estimated by the Generalized Estimating Equations approach to correct for intracluster correlation.
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- Table 3
ORsa for prostate cancer by quartile of serum selenium levels
Selenium quartileb (ng/ml) No. of cases/controls ORs 95% CI Adjusted ORsc 95% CI 1 (<119.3) 75 /62 1.0 1.0 2 (119.3 < 130.6) 64 /63 0.9 0.5–1.5 0.9 0.5–1.4 3 (130.6 < 147.2) 72 /62 0.9 0.6–1.6 1.0 0.6–1.6 4 (≥147.2) 38 /62 0.5 0.3–0.9 0.5 0.3–0.9 Two-sided P for trend 0.02 0.02 -
a ORs and 95% confidence intervals (CIs) were estimated by the Generalized Estimating Equations approach to correct for intracluster correlation.
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b Quartiles were based on the cutpoint value of the controls.
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c ORs were adjusted for cigarette smoking history (nonsmoker, past smoker, or current smoker) in addition to age (by matching).
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- Table 4
ORsa for prostate cancer by serum selenium levelsb, stratified by age at diagnosis, time interval between examination and diagnosis, severity of disease, and cigarette smoking history
Characteristic No. of cases Quartile 2 Quartile 3 Quartile 4 Two-sided P for trend OR (95% CI) OR (95% CI) OR (95% CI) Age at diagnosisc ≤75 years 151 0.8 (0.4–1.8) 1.1 (0.5–2.6) 0.7 (0.3–1.6) 0.19 >75 years 98 1.0 (0.5–2.2) 0.8 (0.4–1.7) 0.8 (0.3–1.8) 0.48 Interval since examc 5–15 years 142 0.9 (0.5–1.8) 1.0 (0.5–1.8) 0.4 (0.2–0.9) 0.03 >15 years 88 0.8 (0.4–1.9) 1.1 (0.5–2.7) 0.7 (0.3–1.6) 0.52 Severity of diseasec Occult 62 0.4 (0.1–1.1) 0.5 (0.2–1.4) 0.4 (0.1–1.2) 0.19 Localized 120 1.1 (0.5–2.2) 1.2 (0.6–2.4) 0.8 (0.4–1.8) 0.76 Advanced 64 1.0 (0.4–2.8) 0.9 (0.4–2.5) 0.3 (0.1–0.8) 0.01 Smoking historyd Nonsmoker 87 0.6 (0.3–1.5) 1.3 (0.6–3.0) 0.8 (0.4–1.9) 0.93 Past smoker 86 1.3 (0.5–3.2) 0.7 (0.3–1.6) 0.5 (0.2–1.1) 0.03 Current smoker 76 0.9 (0.4–2.1) 0.9 (0.4–2.1) 0.2 (0.1–0.8) 0.02 -
a ORs and 95% confidence intervals (CIs) were estimated by the Generalized Estimating Equations approach to correct for intracluster correlation.
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b Quartiles were based on the cutpoint value of the controls. Quartile 1 (lowest) was used as the reference group.
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c Adjusted for cigarette smoking history (nonsmoker, past smoker, or current smoker) in addition to age (by matching).
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d Adjusted for age because the age-matched case-control pairs were not retained in the subgroups.
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Volume 9, Issue 9
