Table 6.
Relationship between serum magnesium and the major risk factors for preterm labour.
| Risk factors | N = 200 | Total serum magnesium level (mg/dL) | P value | ||
|---|---|---|---|---|---|
| Mean ± SD (mg/dL) | Min | Max | |||
| Maternal age | |||||
| 16–20 | 20 | 1.77 ± 0.3 | 1.46 | 3.10 | 0.099 |
| 21–25 | 32 | 1.81 ± 0.4 | 1.39 | 2.97 | |
| 26–30 | 63 | 1.69 ± 0.3 | 1.30 | 3.00 | |
| 31–35 | 52 | 2.10 ± 0.1 | 1.75 | 2.89 | |
| 36–40 | 33 | 1.97 ± 0.2 | 1.66 | 2.45 | |
| Social class | |||||
| Upper | 31 | 2.01 ± 0.6 | 1.69 | 3.11 | 0.101 |
| Middle | 107 | 1.68 ± 0.5 | 1.30 | 2.97 | |
| Lower | 62 | 1.88 ± 0.4 | 1.24 | 2.99 | |
| History of midtrimester miscarriage | |||||
| Yes | 69 | 1.88 ± 0.4 | 1.30 | 2.80 | 0.716 |
| No | 131 | 1.80 ± 0.4 | 1.25 | 2.99 | |
| History of preterm labour | |||||
| Yes | 38 | 1.66 ± 0.5 | 1.30 | 2.60 | 0.059 |
| No | 162 | 1.87 ± 0.4 | 1.25 | 2.99 | |