There was no signifi cant diff erence in the gestational age at
admission between the two groups. A total of 59% of women in
the nifedipine group and 45% of women in the progesterone group
were admitted between 33 and 34 weeks with preterm labour. Th e
mean gestational age at admission in the nifedipine group and
progesterone group was 32 weeks and 31 weeks, respectively. A
total of 45% of patients had a cervical dilatation of 2 cm in the
nifedipine group and 37% of patients had a dilatation of 2 cm in
the progesterone group ( p 0.792). Th e mean cervical length
measured by ultrasound in the nifedipine group was 1.99 cm
and 2.08 in the progesterone group. Th ere was no signifi cant difference
in the mean ultrasound cervical length between the two
groups ( p 0.93).