目標：近年來青少年社會問題層出不窮：暴力、雛妓、飆車、九月墮胎潮等，其中九月墮胎潮更是項隱憂。根據衛生署的統計資料，19歲以下的青少女生育，約5%左右；此部份不適育青少女，懷孕結果是否更不良，將是本研究探討的主題。方法：本研究的資料基本來源是衛生署民國82年至84年的電腦化出生通報登錄。以20-24歲為參考組，12-17、18-19歲為青少女;資料所屬醫院涵蓋榮總、門諾及馬偕；社經變項資料則另行調閱病歷，補抄錄。研究的選取條件是：懷孕週數24週以上、出生體重大於500公克、單胞胎且第一胎。資料經過整理、核對，最後得研究樣本數共約871人 ；12-19歲有296人，20-24歲(參考組)有575人。採用的統計方法有：勝算比(調整)的95% 信賴區間(CI)及邏輯斯迴歸模式。 結果：邏輯斯迴歸分析顯示：(1) 低出生體重模式(共變項：教育程度與地區別)，12-17、18-19歲孕婦的勝算是20-24歲的2.63倍(95% CI: 1.07 - 6.49)、2.28倍(95%CI: 1.2 - 4.34)；(2) 早產模式(共變項：產檢與性別)12-17、18-19歲孕婦的勝算是20-24歲的1.88倍(95% CI: 0.89 - 3.95)、2，22倍(95%CI: 1.38 - 3.56)。結論：適當控制社經變項後，12-17、18-19歲青少女懷孕發生低出生體重與早產的危險性明顯高於20-24歲。因此，年齡是低出生 體重與早產發生的重要因素，12-19歲是不適育的人生階段。

　　　　　Objectives: Teenage pregnancies have been and continue to be a social problem. From official reports, about 5% of births belong to teenage (<19 years old) mothers. This study compares the pregnancy results for teenage mothers with 20-24 year-old pregnant mothers. Methods: "Computerized Medical Birth Registry, 1993-1995" was the main source of data. Data was gathered from hospitals including Veterans General Hospital, Mennuo Hospital and Mackay Memorial Hospital. Meanwhile, the social economic variables wer e collected from the patients records at these three hospitals. The maternal ages of 12-17, 18-19 and 20-24 years were selected and all subjects met the following criteria: gestational age above 24 weeks, birthweight above 500g, singleton and the first parity. At total 871 births were included: 76 births with maternal age of 12-17 years, 220 births with maternal age of 18-19 years and 575 births with maternal age of 20-24 years. The statistical methods included 95% C.I. for (adjusted) odds ratio and logist ic regression model. Results: When compared with subjects with maternal age of 20-24 years, the logistic regression models showed that : maternal age of 12-17, 18-19 years had odds ratio 2.63 (95% CI:1.07-6.49), 2.28 (95%CI: 1.2-4.34) respectively for low birthweight while both education and location covariates included ; maternal age of 12-17, 18-19 years had odds ratio 1.88 (95% CI:0.89-3.95), 2.22 (95%CI: 1.38-3.56) respectively for preterm birth while both prenatal care and gender covariates included. Conclusions: Controlling for social-economic variables, teenage pregnancies had significantly higher risks for low birthweight or preterm births than mother 20-24 years old. Hence, very young age is an important risk factor for low birthweight or preterm birth.