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Table 4 Vitamin D dosage, duration, and serum level interpretation

From: Vitamin D supplementation in children with asthma: a systematic review and meta-analysis

Study name

Vitamin D (Dose-Duration)

Interpretation of serum 25(OH)D levels data as reported in each study

Majak, [ 16 ] 2009

1000 IU/week-nineteenth month

No significant changes were found between study groups

Lewis, [ 18 ] 2012

1,000 IU/day-twelve month

No significant changes were found between study groups

Schou, [ 14 ] 2003

600 IU/day-six weeks

Significantly higher levels were found during vitamin D supplementation period as compared to the levels of placebo period

Majak, [ 17 ] 2011

500 IU/day-six month

25(OH)D serum levels were found insufficient in both study groups