ArticleBirth (Berkeley, Calif.)2026
The Impact of Midwife Experience and Time of Birth on the Risk of Obstetric Anal Sphincter Injuries (OASIS).
Article in Birth (Berkeley, Calif.), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
1 citing paper in PubMed.
- The Impact of Midwife Experience and Time of Birth on the Risk of Obstetric Anal Sphincter Injuries (OASIS).Birth (Berkeley, Calif.) · 2026Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
introductionObstetric anal sphincter injuries (OASIS) are a significant complication of vaginal birth. While most studies focus on patient-related risk factors, the impact of midwife experience and shift timing remains understudied. We examined the association between these factors and OASIS risk in spontaneous vaginal deliveries.
methodsThis retrospective cohort study analyzed term, singleton, cephalic, spontaneous vaginal deliveries at the Galilee Medical Center (March 2020-February 2025), excluding operative vaginal births and cesarean deliveries. Deliveries were categorized by midwife experience: inexperienced (< 2 years), moderately experienced (2-10 years), and highly experienced (> 10 years). Shift timing and delivery patterns within shifts were also examined. The primary outcome was OASIS incidence. Multivariate logistic regression adjusted for confounders such as parity, macrosomia, and second-stage duration.
resultsAmong 13,651 term spontaneous vaginal deliveries, OASIS occurred in 0.6%, with the highest rate among early-career midwives (1.9%) compared to mid-career (0.6%) and experienced midwives (0.5%) (p < 0.001). Associations remained significant after multivariate adjustment. Early-career midwives had a higher risk of OASIS (aOR 3.29, 95% CI 1.49-7.26), while mid-career midwives had a comparable risk to experienced midwives (aOR 1.05, 95% CI 0.60-1.85). Evening shift deliveries (aOR 1.73, 95% CI 1.01-2.96) and deliveries during the last 2 h of a shift (aOR 1.82, 95% CI 1.05-3.14) were also independently associated with increased OASIS risk.
conclusionsPatients delivered by experienced midwives had lower rates of OASIS. This protective effect was especially evident in deliveries without episiotomy. Strengthening midwifery training and optimizing staffing may help improve perineal outcomes.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.