Table 1.
Demographic characteristics of the study population.
| CATEGORICAL | |||||
|---|---|---|---|---|---|
| Age | N (%) | Cycle | N (%) | Race/Ethnicity (%) | N (%) |
| 0–11 | 9392 (24.66) | 1999–2000 (Cycle 1) | 4535 (11.91) | Mexican American | 8760 (23.00) |
| 12–25 | 9555 (25.09) | 2001–2002 (Cycle 2) | 5127 (13.46) | Other Hispanic | 2949 (7.74) |
| 26–50 | 9330 (24.50) | 2003–2004 (Cycle 3) | 4732 (12.43) | Non-Hispanic White | 14384 (37.77) |
| 51–85 | 9803 (25.74) | 2005–2006 (Cycle 4) | 4834 (12.69) | Non-Hispanic Black | 9116 (23.94) |
| 2007–2008 (Cycle 5) | 4628 (12.15) | Other Race | 2871 (7.54) | ||
| 2009–2010 (Cycle 6) | 4946 (12.99) | ||||
| 2011–2012 (Cycle 7) | 4493 (11.80) | ||||
| 2013–2014 (Cycle 8) | 4785 (12.57) | ||||
| CONTINUOUS | |||||
|---|---|---|---|---|---|
| N measured (% of population) | 5th %tile | Median | Mean (SD) | 95th%tile | |
| Age (years) | 38080 (100) | 2 | 26 | 32.1 (24.2) | 77 |
| PIR (−) | 34968 (91.83) | 0.29 | 1.73 | 2.2 (1.6) | 5.00 |
| Cotinine (ng/mL) | 31699 (83.24) | 0.011 | 0.045 | 29.9 (91.4) | 245.00 |
| Creatinine (mg/dL) | 32314 (84.86) | 22.00 | 102.00 | 115.9 (76.6) | 263.00 |