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Table 3 Odds ratio (95% CI) for global cognitive score below 7 across quartiles of iron related dietary pattern among Chinese adults aged ≥55 years old by characteristics, China Health and Nutrition Survey (N = 4852) between 1997 and 2006 a

From: Iron-related dietary pattern increases the risk of poor cognition

  Q1 Q2 Q3 Q4 p for interaction
  Coef. (95% CI)  
Overall sample 1.00 1.06 (0.86–1.30) 1.24 (0.99–1.54) 1.50 (1.17–1.93)  
Overweight/obesity
 No 1.00 1.07 (0.83–1.39) 1.26 (0.96–1.66) 1.54 (1.13–2.10) 0.997
 Yes 1.00 1.06 (0.75–1.50) 1.26 (0.87–1.82) 1.53 (1.00–2.34)
Hypertension
 No 1.00 1.06 (0.82–1.37) 1.21 (0.92–1.59) 1.59 (1.17–2.15) 0.766
 Yes 1.00 1.01 (0.73–1.40) 1.27 (0.89–1.80) 1.34 (0.89–2.02)
Income
 Low 1.00 1.24 (0.89–1.74) 1.24 (0.86–1.78) 1.32 (0.88–1.98) 0.330
 Medium 1.00 0.79 (0.55–1.13) 1.03 (0.71–1.49) 1.42 (0.93–2.17)
 High 1.00 1.09 (0.73–1.62) 1.49 (0.96–2.31) 1.84 (1.12–3.02)
Gender
Men 1.00 1.27 (0.83–1.95) 1.59 (1.04–2.44) 2.10 (1.35–3.29) 0.497
Women 1.00 1.00 (0.78–1.27) 1.11 (0.85–1.45) 1.24 (0.90–1.70)
Urbanization
 Low 1.00 1.52 (0.97–2.39) 1.24 (0.78–1.98) 1.94 (1.21–3.11) 0.323
 Medium 1.00 0.95 (0.63–1.41) 1.25 (0.82–1.89) 1.29 (0.80–2.08)
 High 1.00 0.94 (0.70–1.25) 1.21 (0.88–1.67) 1.33 (0.89–1.98)
Meat intake
 < 50 g/d 1.00 1.13 (0.83–1.53) 1.28 (0.93–1.76) 1.93 (1.36–2.75) 0.085
 ≥ 50 g/d 1.00 1.00 (0.75–1.32) 1.17 (0.86–1.59) 1.05 (0.73–1.52)
  1. a Mixed effect logistic modes adjusted for age, gender, intake of energy and fat, smoking, alcohol drinking, income, urbanicity, education, and physical activity, BMI and hypertension. Stratification variables were not adjusted in the corresponding models
  2. Income was categorized into low, medium and high based on tertiles of year specific income