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Table 1 Baseline characteristics of the Normative Aging Study (NAS) cohort (N = 582)

From: Mitochondrial haplogroups modify the effect of black carbon on age-related cognitive impairment

Characteristics N (%) BC concentration (μg/m3) Mean ± StdDev
Age (Years)    
 50-59 38 (6.5) 0.54 ± 0.30
 60-69 243 (41.8) 0.60 ± 0.28
 70-79 242 (41.6) 0.59 ± 0.27
 80-89 57 (9.8) 0.61 ± 0.35
 90-99 2 (0.3) 0.47 ± 0.40
Education (Years)    
 <12 175 (30.1) 0.63 ± 0.30
 12|–|16 290 (49.8) 0.59 ± 0.28
 >16 117 (20.1) 0.53 ± 0.24
First Language    
 English 498 (85.6) 0.59 ± 0.28
 Not English/Bilingual 84 (14.4) 0.60 ± 0.27
Computer Experience    
 Yes 242 (41.6) 0.56 ± 0.26
 No 340 (58.4) 0.61 ± 0.29
Physical Activity (MET-hr/week)
 <12 324 (55.7) 0.59 ± 0.29
 12|–30 160 (27.5) 0.61 ± 0.29
 ≥30 98 (16.8) 0.57 ± 0.25
Alcohol (drinks/day)    
 <2 439 (75.4) 0.59 ± 0.29
 ≥2 143 (24.6) 0.58 ± 0.25
Diabetes    
 No 499 (85.7) 0.59 ± 0.29
 Yes 83 (14.3) 0.60 ± 0.25
Consumed Dark Fish (times/week)
 <1 497 (85.4) 0.59 ± 0.28
 ≥1 85 (14.6) 0.57 ± 0.28
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Nonwhite (% of census tract)
 <5% 226 (38.8) 0.54 ± 0.30
 5% |—10% 157 (27) 0.55 ± 0.25
 ≥10% 199 (34.2) 0.68 ± 0.26
≥25 years of age with at least a college degree (% of census tract)
 <30% 192 (33) 0.64 ± 0.30
 30% |—50% 230 (39.5) 0.56 ± 0.28
 ≥50% 160 (27.5) 0.58 ± 0.25
Smoking Status    
 Never 172 (29.6) 0.57 ± 0.25
 Former 34 (5.8) 0.63 ± 0.21
 Current 376 (64.6) 0.60 ± 0.30
BMI (Kg/m 2 )    
 <25 136 (23.4) 0.61 ± 0.27
 ≥25 446 (76.6) 0.58 ± 0.28
Hypertension
 No 190 (32.6) 0.56 ± 0.26
 Yes 392 (67.4) 0.61 ± 0.29
Ethnicity    
 English Speaking European countries 263 (45.2) 0.61 ± 0.30
 Mediterranean European countries 141 (24.2) 0.60 ± 0.27
 Others European countries 113 (19.4) 0.55 ± 0.26
 Others 65 (11.2) 0.56 ± 0.27