Table 4 

Summary of selected characteristics of eligible trials of calcium intake. Data are number (percentage) of trials

Characteristics of randomised controlled trialsDietary sources of calcium (n=15)Calcium supplements (n=51)
Agent studied:
 Calcium monotherapy11 (73)36 (71)
 Calcium with vitamin D4 (27)13 (25)
 Multi-arm study with calcium or calcium+vitamin D02 (4)
Calcium dose ≥1000 mg/d6 (40)34 (67)
Calcium dose ≤500 mg/d2 (13)7 (14)
Duration ≤2 years15 (100)37 (73)
Duration ≥3 years013 (25)
Participants living in community15 (100)45 (88)
Most participants women13 (87)48 (94)
Baseline mean age ≥702 (13)18 (35)
Baseline mean dietary calcium intake <800 mg/d9/13 (69)26/39 (67)