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Table 2 Comparison of average values of serum ferritin (ng ml− 1) in gout case–control groups and the association with gout

From: The relationship between ferritin and urate levels and risk of gout

Population Comparison of average Association analysis
p (95% CI)for difference OR (95% CI)a p a OR (95% CI)b p b
NZ European 0.21 (−97.46; 22.02) 1.01 (0.99; 1.03) 0.22 1.00 (0.97; 1.02) 0.84
NZ Polynesian 2.3E–04 (− 211.88; − 66.31) 1.03 (1.01; 1.05) 1.7E–03 1.03 (1.01; 1.06) 1.8E–03
US 6.6E–17 (− 167.19; − 107.16) 1.25 (1.07; 1.17) 1.5E–06 1.11 (1.07; 1.17) 7.4E–06
US no allopurinol 6.6E–17 (−167.19; − 107.16) 1.11 (1.07; 1.16) 4.5E–06 1.11 (1.06; 1.16) 2.4E–05
Meta-analysisc 1.04 (1.01; 1.08) 0.02 1.04 (0.99; 1.09) 0.09
  1. All OR values represent change in risk per 10 ng ml−1 increase in serum ferritin
  2. CI confidence interval, OR odds ratio, NZ New Zealand, US United States
  3. aUnadjusted
  4. bAdjusted for age, body mass index, C-reactive protein and number of self-reported Polynesian grandparents in the NZ Polynesian analyses
  5. cOnly sample sets not stratified for allopurinol exposure were included in the meta-analysis