Table 3.
Results of the vitamin B12 regression analysis.
| Variables | n | I2 | Adj R2 | exp(b) | Std. Err. | t | p | 95% CI |
|---|---|---|---|---|---|---|---|---|
| Testing method | 11 | 73.32% | −1.84% | 0.86 | 0.27 | −0.47 | 0.654 * | 0.43, 1.76 |
| 1.22 | 0.37 | 0.66 | 0.530 # | 0.60, 2.47 | ||||
| 0.67 | 0.16 | −1.64 | 0.139 & | 0.38, 1.18 | ||||
| Year of publication | 15 | 84.87% | 16.62% | 0.96 | 0.02 | −1.74 | 0.105 | 0.92, 1.01 |
| Sample size | 15 | 81.47% | 12.78% | 1.00 | 0.00 | −1.58 | 0.139 | 0.99, 1.00 |
| Quality of studies | 15 | 82.38% | 20.13% | 0.78 | 0.10 | −1.92 | 0.078 | 0.60, 1.03 |
| Average age of patients | 10 | 65.85% | 55.42% | 0.97 | 0.01 | −2.73 | 0.026 | 0.95, 1.00 |
n: number; I2: percentage of total variation across studies; Adj R2: adjusted R2, the proportion of between-study variance; exp(b): the exponentiation of the B coefficient; Std. Err: standard error; t: t statistic, the coefficient divided by its standard error; p: an independent variable would be significant (<0.05) or not significant (≥0.05) in the model; CI: confidence interval; * chemiluminescence; # radioassay; & ELISA.