BioMed Research International / 2014 / Article / Fig 1

Research Article

Maternal Body Mass Index and Risk of Obstetric Anal Sphincter Injury

Figure 1

The effects of birth weight on the risk of any anal sphincter injury in the different maternal body mass index classes. Adjustments were made for year of birth, maternal age, instrumental delivery, and fetal head position. If there were less than five cases in a stratum including a specific maternal BMI class and a specific birth weight odds ratio was not calculated.

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