Comparative Analysis of Fertility, Breastfeeding, and Contraception (1983) / Chapter Skim
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Methods
Methods
Pages 22-30
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From page 22... ...
. Second, the models of conception rates, termination of breastfeeding, and contraceptive di~continuation are analyzed using estimated hazard functions with time-varying cover iates.
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From page 23... ...
These estimated survivor functions are used to evaluate the quality of the duration data. Preference in reporting certain interval lengths, part icular ly troublesome for breas "feeding and for Contras ception, will be revealed in large jumps in the estimated s urvivor functions.
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From page 24... ...
me Z variables represent the more dynamic aspect o f the model and incorporate events or behaviors occurr ing dur ing the interval of interest that can be expected to modify the fundamental shape of the hazard. Either these var tables themselves change over the course of the interval -- for example, breastfeeding when births are the dependent var.
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From page 25... ...
Stably married women are selected to permit treating information on social and economic characteristics of the woman and her husband, collected at the time of the survey, as fixed with respect to both intervals used. Women of parities three and higher were chosen to eliminate intervals between marriage and first birth and to permit the option of using information on infant mortality from the next-to-last closed interval.
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From page 26... ...
hey are included in the fertility equation so that their direct impact on the time to next live~birth conception apart from their indirect effect through breastfeeding and contraception can be ascerta ined . Extensive investigation of the functional specification of these variables was not performed here or elsewhere in ache analysis, in part because these var tables did not per form as well as expected, perhaps due to measurement error.
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From page 27... ...
The variables indicating duration of contraceptive use require some special comment. The WFS for Colombia and Costa Rica provides information on length of use in the closed and the open interval and on current status, but do not give start and stop dates.
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From page 28... ...
dunany-1 if the woman has worked since duty- 1 i f the woman has worked out ~ ide the Other Demograph ic Charac t er i 8 t ic 8 contraceptive method: set of two duty variables. coitus-intepcodent contracept ion: dus - ,r1 if the wean used the pill, IUD or injections in the birth intermural in question.
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From page 29... ...
breastfeeding: du~y-1 if the woman breast fed in the birth interval where cant racept ion occurs . child Survival: du~y=1 if the child born at the start of the birth interval where contracept ion occurs survives longer than two years.
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From page 30... ...
All three equations were estimated separately for each of these Upper ions . LOGISTIC REGRESSION ANALYSIS OF THE: PROBABILITY OF BREASTF':~'lING AND Am: PROBABILITY OF USING CONTRACEPTION The decision to breastfeed or to contracept may be d etermined by factors other than those related to the duration of lactation and contraceptive use.
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