Effect of supplementation with ferrous sulfate or iron bis-glycinate chelate on ferritin concentration in Mexican schoolchildren: a randomized controlled trial

Table 5 Association between iron compound at time of evaluation and low iron storages

Supplement and time of evaluation	OR	95% CI	P value
Supplement
Ferrous sulfate	Ref.
Bis-glycinate chelate	1.40	0.58 – 3.42	0.452
Time of Evaluation
One week post-supplementation	Ref.
6 months after supplementation	1.40	0.56 – 3.49	0.465

Ref. = Reference value.
Mixed effects logistic regression model with random intercept, adjusted by sex, age; ferritin and hemoglobin concentration at baseline. Number of observations: 265, number of groups: 180, observations per group: 1.5 (1–2).

ISSN: 1475-2891