Table 3 Meta-regression of single variable and multivariable
Variables | Number of comparisons | β | 95%Cl | P | R2 |
|---|---|---|---|---|---|
Single variable | |||||
 Publication Year | 13 | −0.03 | −0.11-0.40 | 0.40 | 0.68 |
 Sample size | 13 | 0.0002 | 0.004–0.03 | 0.03 | 0.53 |
 Country(vs Czech Republic) | 13 |  |  |  | 0.99 |
  China | 3 | 0.99 | −0.45-0.64 | 0.67 |  |
  Thailand | 1 | −0.28 | −0.83-0.26 | 0.25 |  |
  Netherlands | 1 | −0.18 | −0.68-0.31 | 0.40 |  |
  Korea | 2 | 0.66 | 0.19–1.13 | 0.01 |  |
  Turkey | 2 | −0.099 | −0.78-0.58 | 0.73 |  |
  Estonia | 1 | 0.072 | −0.52-0.66 | 0.77 |  |
 Location(vs knee) | 13 |  |  |  | 0.16 |
  Hand | 2 | 0.21 | −0.20-0.73 | 0.24 |  |
  Knee and Hip | 1 | 0.34 | −0.95-0.57 | 0.60 |  |
 Stage(secondary OA/primary OA) | 13 | 0.22 | −0.39-0.85 | 0.43 | 0.69 |
Multivariable | |||||
 Mean of Age(years) |  |  |  |  | 0.02 |
  OA | 13 | 0.02 | −0.02-0.06 | 0.28 |  |
  Control | 13 | −0.01 | −0.04-0.01 | 0.40 |  |
 Gender(female%) |  |  |  |  | −0.09 |
  OA | 13 | −0.002 | −0.02-0.02 | 0.98 |  |
  Control | 13 | 0.05 | −0.01-0.02 | 0.52 |  |
 Mean of BMI |  |  |  |  | 0.06 |
  OA | 13 | −0.04 | −0.16-0.08 | 0.43 |  |
  Control | 13 | 0.10 | −0.09-0.30 | 0.26 |  |