Table 1

Analysis of intervention effects on environmental tobacco smoke (ETS) exposure measures using generalised estimating equations (GEE) methods

Exposure measureMean or %GEE estimate
Baseline (n = 143)Post-intervention (n = 133)3 month follow up (n = 132)12 month follow up (n = 127)TimeGroupInteraction
*p⩽0.05; **p⩽0.001; †0.005<p<0.10
NA, “confirmed reducers” not applicable at baseline.
Hair nicotine (log ng/mg)
Hair cotinine (log ng/mg)
Parent reports (log number of cigs in past month)
% confirmed reducers