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Table 2 characteristics of the study participants by diabetes status.*

From: Dietary iron intake in the first 4 months of infancy and the development of type 1 diabetes: a pilot study

  Controls (n = 67) Type 1 diabetes cases (n = 128)  
Variable Median Min, Max Median Min, Max P
Age at diagnosis, y -- -- 3.0 0.16, 6.0 --
Age at recruitment, y 5.0 0.4,10.0 6.0 2.0, 10.0 0.05
Birth weight, kg 3.32 2.3, 4.7 3.32 1.11, 4.91 0.94
Total iron: form., suppl. & breast milk, mg 466 50, 1224 1159 50, 2399 < 0.0001
Iron from formula & supplements, mg 466 0, 1213 1144 0, 2399 < 0.0001
Duration of feeding low-iron formula, wks 12 0, 16 0 0, 16 < 0.0001
Duration of feeding high-iron formula, wks 12 0, 32 10 0, 16 0.10
Duration of breast feeding, wks 12 0, 16 4 0, 16 0.001
Mother had gestational diabetes, % 0   3   0.30
Mother has diabetes, % 3   4   1.00
Sibling rank, %      
   First 42   49   0.44
   Second 49   42   
   Third 6   8   
   Forth or higher 3   1   
  1. * Values are medians, minimum, maximum or percentages.
  2. P values are from the Wilcoxon rank sum test for continuous variables and from the Fisher's exact test for categorical variables.