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Table 3 Distribution of continuous variables of interest in the study population (20–50 year old nonsmokers)

From: Factors associated with self-reported health: implications for screening level community-based health and environmental studies

  Arithmetic mean (SE) Geometric mean (95 % CI) Median IQR 5th, 95th percentile LOD % below LOD
Participant characteristics        
 Age (years) 36.4 (0.32)   36.5 14.4 21.2, 48.8   
 BMI 28.4 (0.22)   27.7 8.1 19.8, 39.1   
 Systolic BP (mm Hg) 117.9 (0.54)   115.5 16.9 96.9, 140.8   
 Diastolic BP (mm Hg) 72.0 (0.48)   70.9 15.2 52.8, 91.5   
 PIR 3.3 (0.08)   3.4 3.1 0.6, 5.0   
Clinical indicators        
 Vitamin D (ng/mL) 23.8 (0.45) 21.9 (21.0, 23.0) 22.7 11 8.90, 38.5 5 0.21
 Vitamin C (mg/dL) 0.98 (0.02) 0.85 (0.81, 0.89) 0.98 0.56 0.24, 1.70 0.012 0
 Total calcium (mg/dL) 9.50 (0.02) 9.49 (9.46, 9.53) 9.45 0.43 8.93, 9.96 2 0
 Glucose, Serum (mg/dL) 92.4 (0.67) 90.5 (89.4, 91.5) 88.1 13.1 73.6, 117.0 3 0
 Direct HDL-Cholesterol (mg/dL) 54.1 (0.54) 52.1 (51.1, 53.1) 51.3 20.5 33.5, 80.9 a  
 CRP (mg/dL) 0.43 (0.04) 0.17 (0.15, 0.18) 0.15 0.34 0.02, 1.41 0.02 2.8
Iron markers        
 Transferrin receptor (mg/L) 3.81 (0.06) 3.60 (3.51, 3.68) 3.4 1.4 2.11, 6.36   
 Ferritin (ng/mL) 56.98 (2.77) 37.14 (34.96, 39.46) 39.2 45 5.65, 177.5   
 Hematocrit (%) 42.4 (0.16) 42.2 (41.9, 42.5) 42.4 6.3 35.5, 49.4   
 Hemoglobin (g/dL) 14.4 (0.05) 14.3 (14.2, 14.4) 14.4 2 11.8, 16.8   
 Mean cell hemoglobin (pg) 30.2 (0.10) 30.1 (29.9, 30.3) 30.4 2.3 26.6, 32.7   
 MCHC (g/dL) 33.9 (0.07) 33.9 (33.8, 34.0) 33.8 1 32.4, 35.1   
 Protoporphyrin (μg/dL RBC) 64.6 (1.51) 58.2 (56.6, 59.9) 53.2 26 34.0, 126.6   
 Iron, Frozen serum (μg/dL) 76.8 (1.47) 68.8 (66.5, 71.2) 71.5 46 28.5, 134.2   
 TIBC, Frozen serum (μg/dL) 365.1 (2.94) 359.9 (355.3, 364.6) 359 80 277.1, 481.2   
 Transferrin saturation (%) 21.8 (0.51) 19.1 (18.4, 19.9) 19.9 14.1 7.00, 39.2   
Environmental exposure        
 Blood lead (μg/dL) 1.34 (0.04) 1.09 (1.04, 1.15) 1.06 0.88 0.46, 2.96 0.3, 0.25 0.4
 Blood cadmium (μg/L) 0.27 (0.006) 0.23 (0.22, 0.23) 0.21 0.18 0.10, 0.59 0.14, 0.2 34.7
 Blood mercury, total (μg/L) 1.73 (0.09) 1.08 (0.97, 1.19) 1.02 1.48 0.21, 5.58 0.2, 0.33 7.6
 Blood benzene (ng/mL) 0.030 (0.002) 0.024 (0.22, 0.026) 0.017 0.014 0.017, 0.060 0.024 57.2
 Blood toluene (ng/mL) 0.162 (0.034) 0.087 (0.078, 0.097) 0.084 0.075 0.024, 0.308 0.025 4.4
 Serum cotinine (ng/ml) 0.27 (0.04) 0.053 (0.046, 0.062) 0.04 0.1 0.01, 1.24 0.015 21.7
  1. Abbreviations: IQR interquartile range, LOD limit of detection, BMI body mass index, PIR ratio of family income to poverty, CRP C-reactive protein, MCHC mean corpuscular hemoglobin, TIBC total iron binding capacity
  2. aThe detection limit for HDL is not found in the NHANES laboratory method for HDL