The Effect of Vitamin D Supplementation for Bone Healing in Fracture Patients: A Systematic Review

Table 2

Newcastle-Ottawa scale summary of observational studies.

Study	Selection	Comparability	Outcome	Overall
Ko et al.	★★★★		★★	6
Gorter et al.	★★★		★	4
Ingstad et al.	★★	★★	★	5
Bodendorfer et al.	★★★★		★	5
Sprague et al.	★★	★★	★	5

Overall score: poor < 4; fair 5-6; good > 7.