Table 4.

Comparison of the previous studies on serum magnesium level in preterm labour with the current study [14, 26–30].

Reference	Serum magnesium level	P value
	(mean ± SD) mg/dL
Kurzal [26]	1.60 ± 0.46	<0.0005
Pushpo and Jagdish [27]	1.67 ± 0.23	<0.001
Smolarczyk et al. [29]	1.64 ± 0.07	<0.003
Wójcicka-Jagodzińska et al. [30]	1.63 ± 0.053	<0.001
Begum et al. [28]	1.77 ± 0.36	<0.001
Shahid et al. [14]	1.87 ± 0.3	<0.001
Present study	1.73 ± 0.4	<0.05