Table 1.

Summary characteristics of included studies

Characteristics	No of trials (No of participants)
Eligible studies:
Total No of trials (No of participants)	50 (74 655)
Median (IQR) follow-up (years)	1.0 (0.7-3.0)
Follow-up at least three years	12 (57 818)
Median (IQR) No of participants	251 (125-839)
Total No of deaths	7993
Median (IQR) % female	64(40-100)
Median (IQR) age (years)	74 (65-80)
Country:
European	29 (32 840)
American	10 (31 240)
Asian-Pacific	10 (10 057)
International country	1 (518)
Baseline 25 hydroxyvitamin D (nmol/L):
<25	4(886)
25-50	21 (15 194)
50-75	16 (24 408)
>75	2 (26 058)