Table 2.
Saliva cotinine concentrations (ng/ml) in non-smoking children aged 11-15 in England by parental smoking
| Year of survey | Mean age (years) | Geometric mean (95% CI) saliva cotinine concentration (ng/ml)
|
||||
|---|---|---|---|---|---|---|
| Non-smoking parents | Only father smokes | Only mother smokes | Both parents smoke | Overall | ||
| 1988 (n=1228) | 13.6 | 0.47 (0.42 to 0.54) | 1.15 (0.98 to 1.35) | 1.91 (1.59 to 2.30) | 3.08 (2.60 to 3.64) | 0.96 (0.83 to 1.11) |
| 1990 (n=1263) | 13.4 | 0.60 (0.53 to 0.67) | 1.36 (1.17 to 1.58) | 2.08 (1.77 to 2.45) | 3.01 (2.59 to 3.50) | 1.06 (0.92 to 1.23) |
| 1992 (n=1334) | 13.4 | 0.34 (0.30 to 0.39) | 1.10 (0.93 to 1.29) | 2.34 (1.94 to 2.82) | 3.33 (2.78 to 3.98) | 0.74 (0.63 to 0.86) |
| 1993 (n=660) | 13.4 | 0.35 (0.32 to 0.40) | 0.90 (0.74 to 1.09) | 1.98 (1.61 to 2.43) | 2.87 (2.33 to 3.53) | 0.66 (0.57 to 0.78) |
| 1994 (n=1128) | 13.4 | 0.28 (0.25 to 0.32) | 0.87 (0.73 to 1.03) | 1.80 (1.49 to 2.19) | 2.88 (2.37 to 3.50) | 0.58 (0.54 to 0.63) |
| 1996 (n=593) | 13.4 | 0.28 (0.24 to 0.33) | 0.71 (0.56 to 0.90) | 1.47 (1.16 to 1.86) | 2.25 (1.72 to 2.96) | 0.56 (0.51 to 0.63) |
| 1998 (n=992) | 13.9 | NA | NA | NA | NA | 0.52 (0.43 to 0.62) |
NA=not available.