Table 2.
The subgroup analysis of studies reporting Mg levels in peripheral blood.
| Subgroups | n of studies | SMD (95% CI) | I2 | P-value |
|---|---|---|---|---|
| All studies | 18 | −0.89 (−1.36, −0.43) | 94.4% | 0.000 |
| Methods | ||||
| AAS | 4 | −2.62 (−4.59, −0.66) | 95.5% | 0.000 |
| ICP-AES | 4 | −0.81 (−2.11, 0.49) | 97.1% | 0.000 |
| Spectrophotometry | 5 | −1.12 (−2.19, −0.04) | 95.2% | 0.000 |
| ICP-MS | 3 | 0.09 (−0.13, 0.31) | 0.0% | 0.881 |
| ISE | 1 | −0.30 (−0.71, −0.11) | - | - |
| - | 1 | 0.14 (−0.20, 0.48) | - | - |
| Geographic locations | ||||
| Asia | 11 | −1.01 (−1.54, −0.47) | 93.1% | 0.000 |
| Europe | 7 | −0.65 (−1.58, 0.28) | 96.2% | 0.000 |
ICP-MS, inductively coupled plasma-mass spectrometry; ICP-AES, inductively coupled plasma-atomic emission spectrometry; AAS, atomic absorption spectrometry; ISE, ion-selective electrode.