Table 2.

Medians of demographic and confounding variables

Variables under study	Groups	Number	Median	Minimum	Maximum	P-value
Gestational age (week)	Control	49	40.0	38.0	42.0	0.5*
	Perineal message	50	40.0	37.0	42.0
Head circumference	Control	49	34.0	30.0	37.0	0.4*
	Perineal message	50	34.0	30.0	36.5

^* Mann-Whitney test