Purpose: This study tries to systematically understand factors that explain levels of happiness among pregnant women in the Ecological systems theory. Methods: A descriptive, cross-sectional study was conducted with 169 pregnant women in Korea. Collected data from self-report questionnaires were analyzed by hierarchical regression analysis using the SPSS statistics 23 program. Results: A total of 5 models were examined according to individual, microsystem, mesosystem, exosystem, and macrosystem

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... in the Ecological systems theory. In the first model including individual factors, extraversion, neuroticism, and physical and psychological change constitute significant factors explaining happiness. In the second model with microsystem factors and in the third one with mesosystem factors, marital intimacy appears to be a significant factor. In the fourth model including exosystem factors, community service is a significant factor. In the final model with social atmosphere, personality (β=.15 for extraversion; β=-.30 for neuroticism), physical and psychological change (β=-.15), marital intimacy (β=.35), and community service (β= .18) turn out to be significant. These factors explain 59% of the variance of happiness in the pregnant women in Korea. Conclusion: Considering the fact that pregnant women's happiness is explained by microsystem and exosystem factors as well as individual factors, developing intervention programs that can promote influencing factors such as marital intimacy and community service is necessary to improve levels of happiness among pregnant women in Korea. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 서 론 1. 연구의 필요성 최근 세계적으로 행복에 대한 관심이 높다. 행복은 삶에 대 한 만족 정도와 긍정 혹은 부정적인 정서의 빈도로 구성되는 개 인의 경험에 대한 주관적인 판단이다[1]. 또한, 행복의 형성 과 정에 대한 통합 이론적 접근에 따르면, 행복은 개인의 유전적 기질, 성격 등에 의해 경험을 보다 긍정적으로 해석하는 개인적 요소뿐만 아니라, 개인이 몸담고 있는 환경에 포함된 다양한 요소들의 상호작용으로 발생하는 긍정적인 경험의 정도에 영 향을 받는다[1]. 즉, 행복은 동일한 경험을 보다 긍정적으로 해 ⓒ 2019 Korean Academy of Community Health Nursing