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Table 3 Odds ratios (95% CI) for the prevalence of hypertension according to the quartile groups of serum ferritin levels in each daytime workers and shift workers

From: Association between serum ferritin and hypertension according to the working type in Korean men: the fifth Korean National Health and nutrition examination survey 2010–2012

  Odds ratio (95% confidence intervals)
Variables Daytime workers Shift workers
Unadjusted Adjusteda Unadjusted Adjusteda
Quartiles of ferritin (ng/mL)
 Quartile 1 (≤ 66.82) Ref. Ref. Ref. Ref.
 Quartile 2 (66.83–100.78) 1.037 (0.811–1.327) 1.125 (0.853–1.484) 1.168 (0.690–1.976) 1.364 (0.738–2.518)
 Quartile 3 (100.79–149.13) 1.127 (0.865–1.469) 1.274 (0.959–1.691) 0.958 (0.571–1.608) 1.088 (0.582–2.031)
 Quartile 4 (> 149.13) 1.297 (1.015–1.657) 1.372 (1.027–1.833) 1.726 (1.015–2.935) 2.009 (1.042–3.873)
  1. FBS fasting blood sugar, TC total cholesterol, TIBC total iron-binding capacity, BMI body mass index
  2. aAdjusted for age, FBS, TC, TIBC, BMI, alcohol intake and smoking status