ArticleBMC pregnancy and childbirth2017
Risk of obstetric anal sphincter injury increases with maternal age irrespective of parity: a population-based register study.
Article in BMC pregnancy and childbirth, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.
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13 citing papers in PubMed, 49 citations in OpenAlex.
- The impact of advanced maternal age on the risk of perineal and anal sphincter injuries in nulliparous women.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2026Article
- Is amniotomy a risk factor for severe perineal trauma? -A Swedish nationwide register study.BMC pregnancy and childbirth · 2026Article
- Factors associated with perineal pain on the first postnatal day after vaginal delivery: a cross-sectional study of primiparous women.Nagoya journal of medical science · 2024Article
- Risk factors associated with severe perineal lacerations during vaginal delivery: a 10-year propensity score-matched observational study.AJOG global reports · 2023Article
- Birthweight difference between deliveries and the risk of obstetric anal sphincter injury in parous women.International urogynecology journal · 2022Article
- Influence of previous delivery mode on perineal trauma risk.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2022Article
- Obstetric anal sphincter injuries-Maternal, fetal and sociodemographic risk factors: A retrospective register-based study.Acta obstetricia et gynecologica Scandinavica · 2022Observational
- The clinical characteristics of perineal tears: A study carried out on 14 pregnant women in a tertiary center: Case series.Annals of medicine and surgery (2012) · 2022Article
- Obstetric anal sphincter injury following previous vaginal delivery.International urogynecology journal · 2021Article
- Could Subtle Obstetrical Brachial Plexus Palsy Be Related to Unilateral B Glenoid Osteoarthritis?Journal of clinical medicine · 2021Article
- Patient's characteristics and incidence of fecal incontinence after primary repair of Obstetric Anal Sphincter Injuries (OASIS) at three Indonesian tertiary hospitals in 2014-2016.European journal of obstetrics & gynecology and reproductive biology: X · 2020Article
- Article
- Risk and protective factors for obstetric anal sphincter injuries: A retrospective nationwide study.Birth (Berkeley, Calif.) · 2018Article
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Authors and funding
2 authors at 1 institution in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundObstetric anal sphincter injury (OASI) is a rare but serious outcome of vaginal birth. Based on concerns about the increasing number of women who commence childbearing later than previous generation, this study aimed at investigating age-related risk of OASI in women of different parity.
methodsA population-based register study including 959,559 live singleton vaginal births recorded in the Swedish Medical Birth Register 1999 to 2011. In each parity group risks of OASI at age 25-29 years, 30-34 years, and ≥35 years compared with age < 25 years were investigated by logistic regression analyses, adjusted for year of birth, education, region of birth, smoking, Body Mass Index, infant birthweight and fetal presentation; and in parous women, history of OASI and cesarean section. Additional analyses also adjusted for mediating factors, such as epidural analgesia, episiotomy, and instrumental delivery, and maternal age-related morbidity.
resultsRates of OASI were 6.6%, 2.3% and 0.9% in first, second and third births respectively. Age-related risk increased from 25-29 years in first births (Adjusted OR 1.66; 95% CI 1.59-1.72) and second births (Adjusted OR 1.78; 95% CI 1.58-2.01), and from 30-34 years in third births (Adjusted OR 1.60; 95% CI 1.00-2.56). In all parity groups the risk was doubled at age ≥ 35 years, compared with the respective reference group of women under 25 years. Adding mediating factors and maternal age-related morbidity only marginally reduced these risk estimates.
conclusionMaternal age is an independent risk factor for OASI in first, second and third births. Although age-related risks by parity are relatively similar, more nulliparous than parous women will be exposed to OASI due to the higher baseline rate.
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