Table 3 Risk Ratios for MetS according to quartiles of eCO and FeNO.

From: Associations of Exhaled Carbon Monoxide and Fractional Exhaled Nitric Oxide with Metabolic Syndrome: A Cohort Study

 

First Quartile

Second Quartile

Third Quartile

Fourth Quartile

Per 1 log-unit increment

eCO

 Model 1 RR(95%CI)

1.00 (referent)

1.29(0.92–1.81)

1.41(1.02–1.94)

1.47(1.06–2.03)

1.16(1.00–1.35)

 Model 2 RR(95%CI)

1.00 (referent)

1.28(0.89–1.85)

1.42(1.01–2.01)

1.44(1.01–2.03)

1.15(1.00–1.36)

 Model 3 RR(95%CI)

1.00 (referent)

1.23(0.87–1.74)

1.35(1.01–1.82)

1.48(1.06–2.06)

1.12(1.02–1.26)

FeNO

 Model 1 RR(95%CI)

1.00 (referent)

1.35(0.97–1.89)

1.13(0.80–1.60)

1.19(0.84–1.68)

1.20(0.95–1.51)

 Model 2 RR(95%CI)

1.00 (referent)

1.37(0.96–1.96)

1.26(0.88–1.82)

1.18(0.81–1.71)

1.25(0.98–1.59)

 Model 3 RR(95%CI)

1.00 (referent)

1.41(0.98–2.03)

1.30(0.90–1.89)

1.22(0.83–1.79)

1.23(0.97–1.57)

  1. Abbreviation: eCO, exhaled carbon monoxide; FeNO, fractional exhaled nitric oxide;
  2. Model 1: adjusted for age (continuous) and sex;
  3. Model 2: adjusted for all variables in Model 1 and body mass index (BMI) (continuous), race (Han, others), marital status (single or divorced, married), education (junior high school or below, senior high school or above), current drinking status (no, yes), diet frequency (times per month, for seven kind of food: grain, coarse, fruits and vegetables, meat and poultry, fishery product, egg and milk, bacon ) and physical activity (no, yes);
  4. Model 3: adjusted for all variables Model 2 and passive smoking (no, yes), current smoking status (no, yes).
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