Objective To analyze the current status of recurrent abortion and contraceptive con-dition among nulliparous adolescent females.Methods Data on abortion and contraception were col-lected from nulliparous adolescent females aged 15 to 24 years who had at least one history of induced or medical abortion and still requested induced or medical abortion for the current pregnancy between July 2019 and June 2024.The influencing factors of recurrent abortion were analyzed.Results The study included 3,081 cases of non-recurrent abortion(including 1,983 induced abortions,1,098 medical abortions)and 804 cases of recurrent abortion(including 475 induced abortions,329 medi-cal abortions)among nulliparous adolescent females.Statistically significant differences were ob-served between recurrent and non-recurrent abortion groups in terms of age composition,marital sta-tus,household registration,and educational level(P＜0.05).Logistic regression analysis revealed that nulliparous adolescent females aged ≤19 years(OR=1.21,95％CI,0.93 to 1.73),with high school education or below(OR=2.13,95％CI,1.77 to 2.82),unmarried(OR=1.92,95％CI,1.25 to 2.64),and non-local household registration(OR=2.68,95％CI,2.19 to 3.63)had an increased risk of recurrent abortion.Among nulliparous adolescent females,the proportion of those who did not use contraception was 62.8％(505/804)among those with a history of repeated abor-tions,which was significantly higher than that among those without a history of repeated abortions[28.1％(865/3,081),P＜0.001].Although there was no statistically significant difference in the pro-portion of those using specific contraceptive methods between the two groups(P＞0.05),the proportion of those using contraception among those with a history of repeated abortions was 37.2％(299/804),which was significantly lower than that among those without a history of repeated abortions[71.9％(2,216/3,081),P＜0.001].Only 0.3％of those with a history of repeated abortions used in-trauterine devices as a contraceptive method.Conclusion Young age,low educational level,being unmarried,and non-local household registration are high-risk factors for recurrent abortion among nulliparous adolescent females.Failure to use contraception or use of ineffective contraceptive meth-ods is the main reason for recurrent induced abortion.Strengthening post-abortion care by medical staff and promoting contraceptive knowledge education and efficient contraceptive methods among ad-olescent females are of great significance in reducing the rate of recurrent induced abortion.

Objective: To study serum zinc level in pregnancy and umbilical cord blood and their association with newborn birth weight. Methods: Pregnant women accepting obstetric examination in Ma'anshan Maternal and Child Care Center were recruited from May 2013 to September 2014. The follow up was conducted during their first, second and third trimesters of pregnancy and the self-designed questionnaire was used to collect information of social and demographic characteristics. Blood samples in the first, second pregnancy period and umbilical cord blood samples were collected and serum concentrations of zinc were assayed. 3 239 mother-infant entered the final analysis. We divided serum zinc level into low (<P₂₅), medium (P₂₅-P₇₅) and high (>P₇₅) groups according to their exposure concentrations at each trimesters. Non-conditional multivariate logistic regression model was conducted to evaluate the association between serum zinc level in first, second trimesters of pregnancy and umbilical cord blood with small for gestational age (SGA) and large for gestational age (LGA). Results: Serum zinc level in P₅₀ (P₂₅-P₇₅) during the first, second trimesters and cord blood were 1 016.18 (907.09-1 145.60), 813.36 (732.47-897.89) and 903.44 (808.71-1 015.64) μg/L, respectively. The prevalence of zinc deficiency during the first, second trimesters and cord blood were 1.5% (44/2 957), 15.9% (492/3 087) and 6.5% (176/2 707), respectively. The prevalence of total SGA and LGA were 9.7% (313/3 239) and 16.5% (536/3 239), respectively. Compared to high-level serum zinc group, the risk of SGA (OR (95%CI) in low-level serum zinc group during first trimesters was 1.51 (1.05-2.19)). Serum zinc level among second pregnancy period and umbilical cord blood had no statistically significant effect on SGA and LGA (both P values >0.05). Conclusion Zinc nutritional status of pregnant women in Ma'anshan city was at a good level. The low serum zinc level in first trimester increased the risk of SGA.