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Table 2 Cotinine concentration distribution and proportion of 10-11 year old children in Wales above each cut-point pre- and post-legislation

From: Changes in child exposure to secondhand smoke after implementation of smoke-free legislation in Wales: a repeated cross-sectional study

Measurement 2007(n = 1447) 2008(n = 1461) p-value
Median cotinine concentration 0.10 0.10 -
Percentage below level of detection (0.1 ng/ml) 43.98 49.90 -
Percentage above cotinine concentration (ng/ml)    
0.1* 56.04 50.10 -
0.2 40.15 39.22 -
0.5 31.44 28.82 -
1 22.88 20.33 -
1.7 14.38 13.48 -
2 12.30 10.95 -
3 7.41 5.57 -
Unadjusted geometric mean (95% CI) cotinine concentration (ng/ml)** 0.17
(0.14 to 0.20)
0.15
(0.13 to 0.18)
0.10
Geometric mean (95% CI) cotinine concentration (ng/ml) adjusted for age, family affluence and time of day data collected** 0.17
(0.15 to 0.20)
0.15
(0.13 to 0.17)
0.07
  1. *including 0.1
  2. ** non-smoking children only