Black carbon exposure distribution in µg/m3 among 651 men undergoing 1933 study visits in the Normative Aging Study (1995–2011), stratified by oxidative stress genetic scores*
| Exposure duration | Number of visits | Mean (SD) | 5th–95th percentiles | IQR |
|---|---|---|---|---|
| Genetic scores below the median | ||||
| 1 year | 820 | 0.6 (0.3) | 0.28–1.23 | 0.43–0.80 |
| 5 years | 524 | 0.6 (0.3) | 0.28–1.13 | 0.44–0.77 |
| Genetic scores above the median | ||||
| 1 year | 1113 | 0.7 (0.3) | 0.29–1.29 | 0.46–0.84 |
| 5 years | 716 | 0.7 (0.3) | 0.30–1.17 | 0.46–0.82 |
*81% (n=529) participants presented for at least two study visits.