Table 2 Weighted characteristics of study population based on sex hormone binding globulin quartiles
Sex hormone binding globulin level (nmol/L) | Q1 (≤ 35.96) | Q2 (35.97–52.0) | Q3 (52.08–75.52) | Q4 (≥ 76.23) | P value |
|---|---|---|---|---|---|
Age (years) | 51.9 ± 5.0 | 53.0 ± 5.0 | 52.8 ± 4.6 | 52.9 ± 4.5 | 0.200 |
Race/Ethnicity (%) | 0.008 | ||||
Non-Hispanic White | 67.8 | 58.4 | 62.6 | 79.5 | |
Non-Hispanic Black | 10.0 | 16.4 | 13.5 | 9.4 | |
Mexican American | 8.9 | 11.8 | 8.0 | 3.7 | |
Other race/ethnicity | 13.3 | 13.5 | 15.9 | 7.3 | |
Education level (%) | 0.006 | ||||
Less than high school | 10.5 | 16.4 | 18.2 | 11.0 | |
High school | 30.4 | 27.9 | 20.9 | 16.1 | |
More than high school | 59.1 | 55.7 | 60.9 | 72.9 | |
Body mass index (kg/m2) | 34.6 ± 7.0 | 31.5 ± 6.4 | 30.4 ± 7.3 | 27.2 ± 6.0 | < 0.001 |
Income to poverty ratio | 3.0 ± 1.5 | 3.1 ± 1.6 | 3.3 ± 1.8 | 3.2 ± 1.7 | 0.309 |
Moderate activities (%) | 0.099 | ||||
Yes | 39.9 | 45.6 | 40.4 | 51.9 | |
No | 60.1 | 54.4 | 59.6 | 48.1 | |
Smoked at least 100 cigarettes in life (%) | 0.116 | ||||
Yes | 41.6 | 42.8 | 34.5 | 47.6 | |
No | 58.4 | 57.2 | 65.5 | 52.4 | |
Had at least 12 alcohol drinks in a year (%) | < 0.001 | ||||
Yes | 57.5 | 75.9 | 62.5 | 83.2 | |
No | 42.5 | 24.1 | 37.5 | 16.8 | |
Blood urea nitrogen (mg/dL) | 5.1 ± 1.6 | 4.9 ± 1.5 | 4.7 ± 1.6 | 4.9 ± 1.7 | 0.107 |
Serum uric acid (umol/L) | 324.0 ± 64.1 | 301.5 ± 68.3 | 285.1 ± 62.8 | 260.8 ± 65.2 | < 0.001 |
Serum phosphorus (mg/dL) | 1.2 ± 0.2 | 1.2 ± 0.2 | 1.2 ± 0.2 | 1.3 ± 0.1 | 0.035 |
Serum calcium (mg/dL) | 2.4 ± 0.1 | 2.4 ± 0.1 | 2.4 ± 0.1 | 2.4 ± 0.1 | 0.517 |
Serum estradiol level (pg/mL) | 23.6 ± 37.7 | 17.8 ± 37.2 | 27.1 ± 45.9 | 28.6 ± 48.2 | 0.140 |
Lumbar bone mineral density (mg/cm2) | 1011.6 ± 137.4 | 998.2 ± 156.4 | 962.9 ± 140.6 | 991.4 ± 142.6 | 0.032 |