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Table 1 Descriptive characteristics for adults 60–84 years of age who had their blood samples analyzed for PCBs, lead and cadmium and did not have a stroke (NHANES 1999–2002)

From: A path analysis of multiple neurotoxic chemicals and cognitive functioning in older US adults (NHANES 1999–2002)

Variable Males and females aged 60–84, who had completed data Males and females aged 60–84, who did not have complete data χ 2 (pvalue)
N (%a) N (%a)  
Age (years)    0.12 (0.73)
 60-69 250 (50.24) 162 (54.00)  
 70-84 248 (49.76) 153 (46.00)  
Race    8.77 (0.03)
 MAb 106 (2.98) 76 (.53)  
 OHc 35 (8.24) 18 (6.78)  
 NHWd 293 (82.02) 160 (78.97)  
 NHBe 64 (6.75) 61 (10.71)  
PIR (range)    2.23 (0.14)
 1st tertile 166 (28.63) 79 (19.93)  
 2nd tertile 167 (32.02) 70 (22.42)  
 3rd tertile 165 (39.35) 57 (22.58)  
 Missing NA 109 (35.07)  
Sex    0.12 (0.73)
 Male 231 (43.45) 150 (43.00)  
 Female 267 (56.55) 165 (57.01)  
Smoking Status    0.08 (0.77)
 Smoker (cotinine > 10 ng/L) 413 (81.01) 253 (80.28)  
 Non-smoker (cotinine ≤ 10 ng/L) 85 (18.99) 55 (17.87)  
 Missing NA 7 (1.85)  
Education    6.81 (0.15)
 Less than 9th Grade 120 (13.09) 91 (12.90)  
 9-11th Grade 80 (16.01) 58 (18.70)  
 High School Grad/GED 121 (30.25) 63 (25.83)  
 Some College or AA degree 96 (21.39) 65 (25.41)  
 College Graduate or above 81 (19.26) 37 (16.93)  
 Missing NA 1 (0.22)  
DSC Scores    7.27 (0.06)
 1st Quartile 131 (15.88) 56 (10.22)  
 2nd Quartile 128 (26.20) 43 (14.88)  
 3rd Quartile 129 (27.87) 51 (19.12)  
 4th Quartile 110 (30.06) 67 (30.69)  
 Missing NA 98 (25.08)  
  1. aWeighted proportion
  2. b MA Mexican American
  3. c OH Other Hispanic
  4. d NHW Non-Hispanic White
  5. e NHB Non-Hispanic Black