Analyses. Continuous variables were summarized as means
with standard deviations and categorical variables were summarized
as percentages. General linear models were used to
model the effect of iron and vitamin D intake on total body
iron stores and circulating vitamin D levels after controlling
for age, sex, race, and transfusion status. When the influence
of race was explored, racial categories were collapsed to compare
white vs non-white races (ie, Asian, black, mixed, other).
Subgroup analyses were also performed in the nontransfused
thalassemia group alone. All inferences are based on twotailed
tests with a threshold of .05 for declaring significance.
All analyses were conducted using Statistical Analysis
Software (version 9.1.3, 2006, SAS Institute).
Analyses. Continuous variables were summarized as meanswith standard deviations and categorical variables were summarizedas percentages. General linear models were used tomodel the effect of iron and vitamin D intake on total bodyiron stores and circulating vitamin D levels after controllingfor age, sex, race, and transfusion status. When the influenceof race was explored, racial categories were collapsed to comparewhite vs non-white races (ie, Asian, black, mixed, other).Subgroup analyses were also performed in the nontransfusedthalassemia group alone. All inferences are based on twotailedtests with a threshold of .05 for declaring significance.All analyses were conducted using Statistical AnalysisSoftware (version 9.1.3, 2006, SAS Institute).
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