Fig 1.
Flow chart of the search results.
Table 1.
Characteristics of the included studies.
Table 2.
Quality assessment of studies.
Fig 2.
Meta-analysis of the correlation between vitamin D and neonatal hyperbilirubinemia in general.
Fig 3.
Sensitivity analysis of included references.
Table 3.
Meta-regression of different bilirubin levels.
Fig 4.
Meta-analysis of the relationship between vitamin D and neonatal hyperbilirubinemia in different subgroups.
Fig 5.
Publication bias among the papers.
The bilirubin level of the case group was concentrated in the 15–20 mg/dl range is Fig 5.
Fig 6.
Publication bias among the papers.
The bilirubin level of the case group was not concentrated in the 15–20 mg/dl range.