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Table 3

Predicted prevalence of elevated A1C among adults aged ≥18 years with and without iron deficiency

Predicted prevalence of women with an A1C ≥5.5%*
Difference in predicted prevalence of A1C ≥5.5% between iron-deficient and iron-sufficient womenPredicted percentage of men with an A1C ≥5.5%*
Difference in predicted prevalence of A1C ≥5.5% between iron-deficient and iron-sufficient men
Iron-deficientIron-sufficientIron-deficientIron-sufficient
n 1,150 5,516  75 3,794  
Unadjusted 26.4 ± 1.8 23.5 ± 0.9 2.8 ± 1.9 45.3 ± 7.5 26.2 ± 1.3 19.1 ± 7.6 
Adjusted for age, race/ethnicity 29.4 ± 1.8 23.1 ± 0.9 6.3 ± 1.8 39.5 ± 9.2 26.2 ± 1.3 13.2 ± 9.3 
Adjusted for above, and waist circumference 27.9 ± 1.7 23.1 ± 0.9 4.8 ± 1.7 31.8 ± 6.0 26.1 ± 1.3 5.7 ± 6.2 
Adjusted for above, and parity, hysterectomy 27.4 ± 1.7 23.3 ± 1.0 4.1 ± 1.7    
Predicted prevalence of women with an A1C ≥5.5%*
Difference in predicted prevalence of A1C ≥5.5% between iron-deficient and iron-sufficient womenPredicted percentage of men with an A1C ≥5.5%*
Difference in predicted prevalence of A1C ≥5.5% between iron-deficient and iron-sufficient men
Iron-deficientIron-sufficientIron-deficientIron-sufficient
n 1,150 5,516  75 3,794  
Unadjusted 26.4 ± 1.8 23.5 ± 0.9 2.8 ± 1.9 45.3 ± 7.5 26.2 ± 1.3 19.1 ± 7.6 
Adjusted for age, race/ethnicity 29.4 ± 1.8 23.1 ± 0.9 6.3 ± 1.8 39.5 ± 9.2 26.2 ± 1.3 13.2 ± 9.3 
Adjusted for above, and waist circumference 27.9 ± 1.7 23.1 ± 0.9 4.8 ± 1.7 31.8 ± 6.0 26.1 ± 1.3 5.7 ± 6.2 
Adjusted for above, and parity, hysterectomy 27.4 ± 1.7 23.3 ± 1.0 4.1 ± 1.7    
Predicted prevalence of women with an A1C ≥6.5%
Difference in predicted prevalence of A1C ≥6.5% between iron-deficient and iron-sufficient women
Iron-deficientIron-sufficient
n 1,150 5,516  
Unadjusted 1.1 ± 0.4 1.3 ± 0.2 0.2 ± 0.4 
Adjusted for age, race/ethnicity 1.1 ± 0.4 1.3 ± 0.2 0.1 ± 0.4 
Adjusted for above and waist circumference 1.0 ± 0.4 1.3 ± 0.2 0.3 ± 0.4 
Adjusted for above and parity, hysterectomy 1.0 ± 0.4 1.3 ± 0.2 0.3 ± 0.4 
Predicted prevalence of women with an A1C ≥6.5%
Difference in predicted prevalence of A1C ≥6.5% between iron-deficient and iron-sufficient women
Iron-deficientIron-sufficient
n 1,150 5,516  
Unadjusted 1.1 ± 0.4 1.3 ± 0.2 0.2 ± 0.4 
Adjusted for age, race/ethnicity 1.1 ± 0.4 1.3 ± 0.2 0.1 ± 0.4 
Adjusted for above and waist circumference 1.0 ± 0.4 1.3 ± 0.2 0.3 ± 0.4 
Adjusted for above and parity, hysterectomy 1.0 ± 0.4 1.3 ± 0.2 0.3 ± 0.4 

Data are % ± SE.

*316 female participants with iron deficiency and 1,478 without iron deficiency had a measured A1C ≥5.5%, 13 male participants with iron deficiency and 1,178 without iron deficiency had a measured A1C ≥5.5%.

P < 0.05.

‡32 female participants with iron deficiency and 102 without iron deficiency had a measured A1C ≥ 6.5%.

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