目標：本文旨在探討台灣育齡已婚人口非計畫懷孕現況、相關因素與婦女懷孕結果。方法：以2008年「第十次家庭與生育力調查」完訪之2,603名20至49歲已婚婦女為對象，比較不同社會人口學背景特徵已婚婦女之非計畫懷孕經驗，探討其與個人生育經驗、知識及對婚姻態度之相關，並分析比較以人工流產終止懷孕之百分比在計畫懷孕與非計畫懷孕婦女之差異。結果：77.2%已婚婦女曾有非計畫懷孕經驗，其中近70.0%曾重複非計畫懷孕。年紀較輕、教育程度越低、自述經濟狀況不佳、或活產數越多之已婚婦女，非計畫懷孕之風險明顯較高。非計畫懷孕婦女以人工流產終止懷孕之百分比，顯著高於計畫懷孕婦女。結論：我國育齡已婚人口非計畫懷孕百分比偏高，且因社會人口學特性不同而呈現明顯差異，為降低非計畫懷孕之不良影響，應針對高風險族群提供相關宣導及介入服務。(台灣衛誌 2011；30(4)：372-387)

Objectives: The aims of this study were to examine the proportion of unplanned pregnancies among married couples in Taiwan, their association with potential risk factors, and the results of those pregnancies. Methods: Data from the 2008 Women and Fertility Survey of a national
representative sample of 2,603 married women aged 20-49 were analyzed. We compared the proportion of unplanned pregnancies among subgroups characterized by socio-demographic factors, experience of child-bearing, and their knowledge about and attitude toward marriage. The difference in induced abortion rates between women with planned and unplanned pregnancies was also examined. Results: A total of 77.2% of the married women had ever had an unplanned pregnancy. Near 70% of those had repeated unplanned pregnancies. Younger age, lower educational attainment, poor self-rated economic status, and more live births were significantly
associated with unplanned pregnancies. The induced abortion rates were higher among women with unplanned pregnancies than among women who planned pregnancy. Conclusions: The proportion of unplanned pregnancies among married couples in Taiwan was high. Sociodemographic factors were significant predictors of unplanned pregnancy. The provision of health
education and intervention services that focus on high-risk groups is crucial in order to reduce the adverse outcomes of an unplanned pregnancy. (Taiwan J Public Health. 2011;30(4):372-387)