Table 1.
Characteristics of cases and controls#
| Cases | Controls | |
|---|---|---|
| Covariates | n=467 | n=936 |
| Body mass index (kg/m2), mean (SD) | 26.2 (4.0) | 26.5 (4.1) |
| Age at blood draw (years), mean (SD) | 68.9 (7.1) | 68.7 (7.1) |
| Fasting hours prior to blood draw, mean (SD) | 11.8 (4.8) | 11.9 (4.9) |
| High school education or less, % | 34.0 | 34.4 |
| Family history of prostate cancer, % | 12.6 | 8.3 |
| Ethnicity, % | ||
| African-American | 46.9 | 46.8 |
| Caucasian | 13.1 | 13.1 |
| Japanese-American | 18.8 | 18.8 |
| Latino | 17.8 | 17.7 |
| Native Hawaiian | 3.4 | 3.5 |
| Analytes median (interquartile range) | ||
| Testosterone (ng/dl) | 550 (422 - 689) | 541 (425 – 683) |
| Dihydrotestosterone (ng/dl) | 58 (42 – 78) | 57 (43 – 75) |
| 3α-androstanediol glucuronide (ng/ml) | 4.71 (3.15 - 6.69) | 4.47 (3.18 – 6.63) |
| Sex hormone-binding globulin (nmol/L) | 36 (28 - 45) | 35 (27 – 46) |
| Insulin-like growth factor I (ng/ml) | 182 (148 – 217) | 180 (151 – 222) |
| Insulin-like growth factor II (ng/ml) | 876 (728 – 1039) | 900 (744 – 1062) |
| Insulin-like growth factor binding protein 1 (ng/ml) | 21 (11 – 36) | 20 (11 – 38) |
| Insulin-like growth factor binding protein 3 (ng/ml) | 3892 (3201-4664) | 3971 (3387 – 4591) |
#
Cases and controls were matched on geographic site (Hawaii/ Los Angeles, Ca), ethnicity, age at specimen collection (± 1 year), date (± 1 month) and time of day (± 2 hours) of sample collection, and fasting status (<6, 6-7, 8-9, 10+ hours).