Table 1.

Baseline population characteristics for the NHANES IIIa

VariableKidney DiseaseNo Kidney DiseaseP
n/NParameter EstimateSEn/NParameter EstimateSE
Demographics
    age (yr; mean)875/627073.90.55395/627063.40.3<0.0001
    female gender (%)493/87561.82.62782/539554.170.70.01
    race/ethnicity (%)<0.0001
        non-Hispanic white637/87586.82.12989/539583.01.3
        non-Hispanic black145/8757.60.91081/53957.90.6
        Hispanic72/8751.00.21123/53952.90.2
        other21/8754.62.0202/53956.21.1
Medications and nutrition
    estrogen use (%)26/8755.21.7364/53959.40.60.01
    diuretic use (thiazides and     nonthiazides) (%)356/76848.22.5836/338522.41.2<0.0001
    dietary calcium (mg; mean)751/5753664.921.05002/5753770.012.60.0001
    dietary alcohol (g; mean)751/57532.41.05002/57537.20.70.0001
    dietary vitamin A (IU; mean)751/57537547.6336.05002/57537775.9216.80.59
    serum vitamin A (μg/ml; mean)874/62402.60.035366/62402.20.02<0.0001
    serum vitamin D (ng/ml; mean)819/606527.80.55246/606528.10.30.59
    serum calcium (mg/dl; mean)875/62699.40.035394/62699.30.020.0001
    serum phosphorus (mg/dl; mean)875/62703.50.025395/62703.40.01<0.0001
    serum alkaline phosphatase (U/L; mean)875/626995.81.55394/626990.11.20.002
Medical history
    diabetes (%)178/87516.51.3712/53899.60.5<0.0001
    osteoporosis (%)60/8719.21.5192/53724.30.40.003
    postmenopausal status (%)419/42299.00.72430/261090.81.0<0.0001
    tobacco use (%)119/18165.95.41172/150675.41.70.10
    history of hip fracture in mother (%)50/8466.01.3390/51939.00.50.06
Body measurements and activity
    weight (kg; mean)873/625573.50.85382/625576.00.30.001
    femoral neck BMD (g/cm2; mean)767/59360.6900.015169/59360.7400.00<0.0001
    activity level (%)0.03
        high300/84137.22.82030/527642.01.1
        average365/84143.32.92307/527642.41.1
        low176/84119.51.4930/527615.60.7
  • a BMD, bone mineral density; NHANES III, Third National Health and Nutrition and Examination Survey.