Table 3. Mean Change of Vitamin D Levels and HbA1c at Follow-Up.

Vitamin D	n	Vitamin D baseline (mean ± SD)	HbA1c baseline (mean ± SD)	Vitamin D follow-up (mean ± SD)	HbA1c follow-up (mean ± SD)	Mean change vitamin D (P value)	Mean change HbA1c (P value
< 20	184	14.17 ± 3.89	10.62 ± 2.45	68.11 ± 29.02	7.63 ± 1.61	+53.94 (0.0001)	-2.99 (0.0001)
≥ 20 and < 50	547	33.58 ± 8.23	10.86 ± 2.6	74.46 ± 25.84	7.89 ± 1.7	+40.88 (0.0001)	-2.97 (0.0001)
≥ 50 and < 75	177	60.33 ± 7.03	9.93 ± 2.56	92.27 ± 20.02	7.37 ± 1.39	+31.94 (0.0001)	-2.56 (0.0001)
≥ 75	92	91.75 ± 15.14	9.81 ± 2.52	118.66 ± 31.12	7.4 ± 1.16	+26.91 (0.0001)	-2.41 (0.0001)

HbA1c: glycated hemoglobin.