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Table 2 Urinary geometric mean (GM) concentration of creatinine(μg/g creatinine) categorized by public transportation usage

From: Female non-smokers’ environmental tobacco smoking exposure by public transportation mode

    Crude    Adjusteda   
  Category N(%) GM(±SE) 95% CI p-value GM(±SE) 95% CI p-value
Modes of transportation
  Subway 262(19.8) 1.66(1.06) 1.48–1.85 .401 1.72(1.06) 1.54–1.92 .499
  Bus 1002(75.8) 1.77(1.03) 1.67–1.87   1.75(1.03) 1.65–1.85  
  Taxi 58(4.4) 1.94(1.13) 1.53–2.46   2.00(1.12) 1.59–2.52  
Using frequency(per week)
  1–6 826(62.5) 1.72(1.03) 1.62–1.83 .675 1.73(1.03) 1.63–1.84 .774
  7–13 414(31.3) 1.80(1.05) 1.65–1.97   1.80(1.05) 1.65–1.96  
  ≥14 82(6.2) 1.80(1.11) 1.48–2.20   1.77(1.10) 1.46–2.15  
  1. aAdjusted by Age, BMI, Education, Household income, Involuntary smoking, Marital status, Region GM Geometric Mean SE Standard Error CI Confidence Interval