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KMID : 0353019740110010019
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Korean Journal of Public Health
1974 Volume.11 No. 1 p.19 ~ p.24
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A Case Study of Birth Interval with and Without Family Limitation
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Abstract
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The birth intervals with and without family limitation to successive birth order are analyzed from the data, which were kindly made available by the Korean Institute for Family Planning, concerning the reproduction histories of 5,484 married Korean women who have had at least one live birth.
The data of reproduction history of 6,285 married women aged less than 54 were collected by the Institute during the period of September 1-October 31, 1971.
The computation of mean birth interval was based on "life table technique" suggested by Sheps in order to reduce the effect of selection against long intervals due to the truncation of reproduction history by the interview.
The summary of the findings is as follows;
(1) Mean birth intervals by birth order in the absence of family limitation(Use of contraceptive or induced abortion).
For further reduction of truncation effect on the mean interval, only birth interval of which preceding birth occurred before 1966 (i. e. approximately 5 years from the time of interview) were included in the calculation of mean interval.
The estimated mean interval between 1st and 2nd birth in the absence of family limitation is 27.7 months (Standard deviation: 13.5 months) which is shorter by about 4 months as compared with those of higher birth orders.The estimated mean interval between the successive births after the second birth ranges from 31.5 mouths to 31.8 months(Standard deviation: 9.7 months-10.4 months) without showing any consistent tendency for the mean to change with birth order (See Table 1).
(2) Mean birth intervals by birth order with family limitation(Use of contraceptive or induced abortion).
The birth interval with family limitation means the interval between two successive births when the family limitation was practiced after the preceding birth but it ended up with failure or discontinuation since should it be continuously successful there would be no birth to follow.
The estimated mean interval between 1st and 2nd birth with family limitation is 30.9 months(Standard deviation: 14.7 months) which is shorter by about 8 mouths than those of higher birth orders.
The estimated mean interval between the other successive birth ranges from 37.9 months to 39.9 months(Standard deviation: 11.0 months-14.7 months) showing a slight tendency for the mean to increase with birth order(See Table 2).
The difference in mean interval between the two groups, one without family limitation and the other with family limitation(which ended up with failure or discontinuation), is 3.2 months to the 1st and 2nd birth while it ranges from 6.4 months to 8.3 months to the higher birth orders(See Table 3).
(3) Mean birth intervals by calendar year in which the preceding birth occurred.
Obviously due to truncation effect, the mean intervals of which the preceding birth occurred in 1967∼1970 (i. e. less than 5 years preceding the interview) are relatively shorter than those of which preceding birth occurred before 1967.
Regarding intervals of which preceding birth occurred before 1967, there is no consistent tendency for the mean interval to decrease with calendar year.
This might imply that, in the absence of family limitation, the most of the case which failed to have live birth within 5 years after the preceding one can be regarded as "sterile"(See Table 4).
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