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Table 1 Description of sample pre- and post- Welsh legislation

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

Characteristic 2007(n = 1611)
n (%)
2008(n = 1605)
n (%)
Mean age* (years) 10.97(.41) 10.94(.49)
Boys 778(49.53) 792(49.38)
Family affluence scale** (n = 1555) (n = 1528)
Low 422(27.14) 360(23.56)
Medium 606(38.97) 621(40.64)
High 527(33.89) 547(35.80)
Self-reported smoking status
Non-smokers 1569(97.39) 1580(98.44)
Smokers 24(1.49) 18(1.12)
Missing 18(1.12) 7(0.44)
Cotinine confirmed smoking status***
Non-smokers 1405(97.09) 1434 (98.15)
Smokers**** 26(1.80) 20(1.37)
Missing***** 16(1.11) 7 (0.48)
Family structure (parent figure that sample lives with)
Both parents 1120(69.52) 1090(67.91)
Parent and step parent 159(9.87) 170(10.59)
Single mother 275(17.07) 266(16.57)
Single father 18(1.12) 24(1.50)
Grandparent 17(1.06) 20(1.25)
Other****** 8(0.50) 10(0.60)
Missing 14(0.86) 25(1.56)
  1. * age at date of data collection
  2. ** children who report living in both parent, step- or single parent families only (data broken into approximately equal tertiles, with differences in group sizes arising due to tied values: low = 4-8 on FAS scale, medium = 9&10, high = 11-13)
  3. *** limited to children within 71 schools where children provided saliva samples at both time points
  4. **** children classified as smokers if self report as smokers, or if cotinine concentration >15 ng/ml (regardless of self report)
  5. ***** students who did not answer the smoking question or who had a contaminated saliva sample, or insufficient sample volume
  6. ****** includes live in a foster home, or children's home, or that another adult lives with them