Table 2.

Subgroup analysis of HGS.

	Subtotal (n)	Number of studies (n)	WMD (95% CI)	P-value
Age
>50	2,736	4	1.353 (−0.238; 2.944)	0.096
>60	870	4	1.116 (0.433; 1.799)	0.001
>70	623	2	−0.379 (−0.944; 0.186)	0.189
With calcium or not
with calcium	3,816	6	0.478 (−0.165; 1.122)	0.145
without calcium	413	4	1.931 (0.166; 3.697)	0.032
Baseline serum vitamin D level
<30 ng/ml	1,125	6	1.445 (0.486; 2.403)	0.527
>30 ng/ml	757	3	0.478 (−0.963; 1.918)	0.003
Vitamin D dosage (IU/day)
<1,000	2,769	3	0.206 (−0.218; 0.630)	0.341
≥1,000	847	3	0.161 (−0.911; 1.234)	0.768
vitamin D analogs	613	4	2.118 (1.024; 3.213)	0
Supplementation duration
>12	3,059	3	0.621 (−0.219; 1.461)	0.147
<12	1,170	7	1.193 (−0.090; 2.477)	0.068

WMD, weighted mean difference; CI, confidence interval.