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Multilingual Demographic Dictionary, second unified edition, English volume
Pregnancy intervals
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In computing the period of exposure to the risk of conception 1 it is necessary to consider pregnancy intervals 2. The interval between marriage and the first pregnancy is the conception delay 3 or first pregnancy interval 3. The period between the end of one pregnancy and the beginning of the next is the inter-pregnancy interval 4. If the time when the woman had no sexual activity is subtracted, a net inter-pregnancy interval 5 is obtained. The period between the end of the last pregnancy and the date of a survey is called an open inter-pregnancy interval 6. More...