Table 2.

Mean comparison between pairs of smoking and SHS categories (model 1) a

Adjusted mean difference b (P value; 95% confidence limits)
NeSPFSNPFSPCS
NeSNP3.07 (P < 0.001; 1.92–4.22)0.84 (P = 0.29; −0.71–2.39)6.68 (P = 0.003; 2.20–11.16)1283.85 (P < 0.001; 1178.47–1389.23)
NeSP−2.24 (P = 0.02; −4.06–−0.41)3.61 (P = 0.12; −0.94–8.15)1280.7 (P < 0.001; 1175.39–1386.16)
FSNP5.85 (P = 0.01; 1.37–10.32)1283.01 (P < 0.001; 1177.63–1388.39)
FSP1277.16 (P < 0.001; 1171.70–1382.63)
  • aGLM model controlling for country (P = 0.34), sex (b = 1.44, P = 0.04), age (b = −0.025, P = 0.41), and BMI (b = 0.19, P = 0.008), with Gamma distribution, intercept of 1,283.16 (1,176.64 − 1,388.67).

  • bTo convert nmol/L to ng/mL divide cotinine mean by the factor 5.68.