Table 2 Subgroup analysis to investigate differences between studies included in meta-analysis
From: The relationship between serum vitamin D and fracture risk in the elderly: a meta-analysis
Subgroup | Studies | RR (95% CI) | I2 (%) | P value |
|---|---|---|---|---|
Gender | ||||
 TF | ||||
  Men | 4 | 1.04 (0.85, 1.22) | 28.1 | 0.24 |
  Women | 4 | 1.14 (0.95, 1.24) | 13.5 | 0.33 |
 HF | ||||
  Men | 2 | 0.99(−0.02, 2.00) | 56.2 | 0.13 |
  Women | 3 | 1.25 (0.75, 1.75) | 16.3 | 0.3 |
Region | ||||
 Europe | 6 | 0.88 (0.76, 1.01) | 73.3 | 0 |
 Asia | 3 | 1.5 (1.04, 1.96) | 0 | 0.7 |
 USA | 9 | 0.98 (0.88, 1.08) | 70.7 | 0 |
 Australia | 2 | 1.08 (0.86, 1.30) | 59.8 | 0.12 |
Start time | ||||
 TF | ||||
  Before 2010 | 4 | 1.11 (0.93, 1.28) | 0 | 0.82 |
  After 2010 | 7 | 1.12 (0.99, 1.24) | 49.1 | 0.07 |
 HF | ||||
  Before 2010 | 8 | 0.99 (0.87, 1.10) | 72.4 | 0 |
  After 2010 | 4 | 0.73 (0.58, 0.88) | 22.5 | 0.28 |