Sixteen randomized trials comparing 'routine' induction of labour at a specified gestational age with a policy of selective induction of labour in response to an abnormal antepartum test are summarized in Table 22.3.
These trials form the basis of a systematic review by Sanchez-Ramos et al. . Twelve of them had been previously included in the Cochrane Review by Crowley . One trial is larger than all others and contributes considerable weight to both meta-analyses .
Both meta-analyses adopt an inclusive approach and include trials of variable size and quality. The gestational age at trial entry varies from 287 days to 294 days gestation. A variety of methods of antepartum fetal testing are used to supervise pregnancies in the expectant arm of the trials.
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The first trimester is very important for the mother and the baby. For most women it is common to find out about their pregnancy after they have missed their menstrual cycle. Since, not all women note their menstrual cycle and dates of intercourse, it may cause slight confusion about the exact date of conception. That is why most women find out that they are pregnant only after one month of pregnancy.