Table 2.
White blood cell counts (cells/mm3) by decade of age of never smokers
| Group by decade of age (years) | Year of study | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2002 | 2010 | |||||||||||
| No.a | AM | ASD | 5 percentile | 95 percentile | pb | No.a | AM | ASD | 5 percentile | 95 percentile | pb | |
| 20–29 | 5,762 | 5,728.2 | 1,434.6 | 2,916 | 8,540 | 7,455 | 5,846.5 | 1,459.0 | 2,987 | 8,706 | ||
| 30–39 | 10,031 | 5,600.8 | 1,382.5 | 2,891 | 8,311 | ↓↓ | 11,563 | 5,685.5 | 1,414.0 | 2,914 | 8,457 | ↓↓ |
| 40–49 | 7,367 | 5,539.5 | 1,333.6 | 2,926 | 8,153 | ↓↓ | 12,173 | 5,588.8 | 1,384.3 | 2,876 | 8,302 | ↓↓ |
| 50–59 | 8,134 | 5,603.4 | 1,368.0 | 2,922 | 8,285 | ↑↑ | 6,440 | 5,606.3 | 1,382.3 | 2,897 | 8,316 | ns |
| 60–69 | 2,542 | 5,613.8 | 1,303.8 | 3,058 | 8,169 | ns | 2,787 | 5,587.3 | 1,419.9 | 2,804 | 8,370 | ns |
| 70–79 | 414 | 5,462.3 | 1,342.3 | 2,831 | 8,093 | ↓ | 319 | 5,599.7 | 1,402.0 | 2,852 | 8,348 | ns |
| 80+ | 48 | 5,391.7 | 1,411.9 | 2,624 | 8,159 | ns | 11 | 5,427.3 | 1,530.4 | 2,428 | 8,427 | ns |
aNumber of cases
bp for difference from the immediately younger group by Scheffé; two arrows, one arrow, and ns show p ≤0.01, ≤0.05, and >0.05, respectively. The direction of arrows indicates an increase or a decrease