Magnesium Sulfate as a Second-Line Tocolytic Agent for Preterm Labor: A Randomized Controlled Trial in Kyushu Island

Table 1

Maternal demographic and clinical characteristics at randomization.

	Magnesium-alone group	Combination group	Comparison
No. of pregnancies	14	19	—
Twin gestations	1 (7%)	4 (21%)	NS
Maternal age (years)	31.3 ± 4.6	30.3 ± 4.8	NS
Nulliparous women	8 (57%)	8 (42%)	NS
Prior preterm birth	1 (7%)	3 (16%)	NS
Gestational age on admission (wk)	28.3 ± 4.4	27.2 ± 3.4	NS
Gestational age at start of ritodrine (wk)	28.1 ± 3.7	27.6 ± 3.2	NS
Gestational age at start of MgSO4 (wk)	29.3 ± 3.2	28.6 ± 3.4	NS
Cervical dilatation ≥3 cm	0/14	0/19	NS

NS; not significant. MgSO₄; magnesium sulfate. Mean ± SD.