Table 1 Characteristics of the study population in the Normative Aging Study (2000 to 2016)
From: Metabolomic signatures of the long-term exposure to air pollution and temperature
Demographic Characteristics | At first visit (2000 to 2013) (N = 456) | All visits (2000 to 2016) (N = 648) |
|---|---|---|
Age, Mean (SD) | 75.0 (6.70) | 76.0 (6.68) |
Body mass index (kg/m2), Mean (SD) | 27.7 (4.19) | 27.7 (4.27) |
Years of education, Mean (SD) | 15.1 (3.00) | 15.0 (3.00) |
Baseline annual income, thousands of 1965 $US, Mean (SD) | 8.61 (3.77) | 8.64 (3.78) |
Smoking | ||
 Never, N (%) | 128 (28) | 190 (29) |
 Current, N (%) | 14 (3) | 21 (3) |
 Former, N (%) | 314 (69) | 437 (67) |
Pack-year smoked (years), Mean (SD) | 21.4 (25.2) | 20.95 (25.36) |
Season | ||
 Cold: October–March, N (%) | 189 (41) | 259 (40) |
 Warm: April–September, N (%) | 267 (59) | 389 (60) |
Alcohol consumption (≥2 drinks per day), N (%) | 95 (21) | 132 (20) |
Mean (SD), (IQR) of the exposure levels | ||
 Average of 365 days of PM2.5 (μg/m3) | 10.4 (1.28), (2.49) | 10.1 (1.31), (2.12) |
 Average of 365 days of NO2 (ppb) | 19.1 (2.40), (4.52) | 18.4 (2.35), (4.00) |
 Average of 365 days of O3 (ppb) | 23.7 (1.06), (1.39) | 24.0 (1.12), (1.45) |
 Average of 365 days of Temperature (°C) | 11.0 (0.64), (1.00) | 11.0 (0.60), (0.89) |