Table 2.
Distribution of 2-y average concentrations () at baseline.
| Year | Overall cohort | Nonhypertensive participants with follow-up | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n | Mean (SD) | 25th percentile | 50th percentile | 75th percentile | n | Mean (SD) | 25th percentile | 50th percentile | 75th percentile | ||||||||||||
| 2001 | 56,688 | 25.0 (7.4) | 19.9 | 22.5 | 28.7 | 27,605 | 24.8 (7.4) | 19.9 | 22.3 | 25.6 | |||||||||||
| 2002 | 42,830 | 26.6 (8.3) | 21.0 | 23.5 | 35.0 | 18,107 | 26.5 (8.3) | 20.8 | 23.4 | 34.4 | |||||||||||
| 2003 | 29,159 | 28.8 (8.4) | 23.0 | 25.8 | 36.0 | 11,178 | 28.8 (8.4) | 23.1 | 25.8 | 36.0 | |||||||||||
| 2004 | 28,942 | 29.9 (8.8) | 23.7 | 26.5 | 38.6 | 11,544 | 29.9 (8.8) | 23.6 | 26.5 | 38.9 | |||||||||||
| 2005 | 28,282 | 27.4 (7.8) | 22.2 | 24.5 | 29.8 | 10,653 | 27.4 (7.6) | 22.3 | 24.8 | 30.9 | |||||||||||
| 2006 | 26,989 | 26.9 (6.9) | 22.5 | 24.6 | 27.7 | 9,512 | 26.9 (6.8) | 22.5 | 24.8 | 27.5 | |||||||||||
| 2007 | 26,882 | 26.8 (6.6) | 22.6 | 24.9 | 27.6 | 8,863 | 26.8 (6.5) | 22.7 | 25.0 | 27.4 | |||||||||||
| 2008 | 23,516 | 26.8 (6.7) | 22.6 | 24.7 | 27.4 | 7,567 | 26.8 (6.6) | 22.6 | 24.8 | 27.3 | |||||||||||
| 2009 | 18,930 | 27.2 (7.2) | 22.5 | 24.9 | 30.0 | 6,125 | 27.7 (7.3) | 22.7 | 25.3 | 31.4 | |||||||||||
| 2010 | 20,471 | 25.9 (7.2) | 21.5 | 23.3 | 26.7 | 6,077 | 26.3 (7.4) | 21.6 | 23.6 | 29.6 | |||||||||||
| 2011 | 18,484 | 25.5 (7.1) | 20.8 | 23.1 | 26.2 | 4,944 | 25.7 (7.1) | 21.0 | 23.4 | 26.2 | |||||||||||
| 2012 | 20,696 | 24.4 (6.2) | 20.3 | 22.8 | 25.3 | 3,123 | 24.3 (5.7) | 20.9 | 22.9 | 25.2 | |||||||||||
| 2013 | 15,366 | 23.7 (5.9) | 19.8 | 22.2 | 25.5 | 615 | 23.8 (5.0) | 20.7 | 22.9 | 25.3 | |||||||||||
| 2014 | 4,325 | 24.4 (4.5) | 21.2 | 24.1 | 26.1 | — | — | — | — | — | |||||||||||
| All | 361,560 | 26.5 (7.6) | 21.6 | 23.9 | 28.5 | 125,913 | 26.7 (7.7) | 21.6 | 24.0 | 28.9 | |||||||||||
Note: —, the end year of the study period is 2014; therefore participants enrolled in 2014 had no follow-up and were not included in the incident analysis. SD, standard deviation.