The retention rate varied between the two groups, which
indicated that relaxation was associated with pregnancy
outcomes. During intensive weekly follow-ups, only one
participant was removed from the follow-up study period
after being transferred to another medical centre. One week
after entry into the study, 11 (16%) women delivered
preterm in the experimental group, whereas 18 (30%)
women delivered preterm in the control group. Two weeks
after entry into the study, four (7%) women delivered
preterm in the experimental group, and eight (19%) women
delivered preterm in the control group. The rate of attrition
because of preterm birth was higher in the control group than
in the experimental group. Further studies are required to
validate pregnancy outcomes to expand the effects of
relaxation.