Abstract
Purpose: The purpose of this study is to analyze the difference in incidence of uterine inertia and prolonged labor between pregnant women with hiesho and those without hiesho and to estimate the causal effects.
Method: The study design was a retrospective cohort study. The analysis was conducted on 2,540 women in hospital after delivery, over the approximately twelve months between October 19, 2009 and October 8, 2010 (response rate: 60.8%). The research methods employed were a self-administered questionnaire and data extraction from medical records. In this analysis, confounding factors were adjusted by carrying out analysis of covariance and stratified analysis using propensity scores.
Results: Of study respondents, 41.9 percent had hiesho. The regression coefficient of hiesho was 0.69, p<0.001 and the odds ratio was 2.00 for uterine inertia (analysis of covariance). The regression coefficient of hiesho was 0.83, p<0.001 and the odds ratio was 2.38 for prolonged labor (analysis of covariance).
Conclusion: The incidence of uterine inertia was twice as high among pregnant women with hiesho than those without hiesho, and the incidence of prolonged labor was 2.3 times higher. It was inferred that hiesho may have causal effects on uterine inertia and prolonged labor.
