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Odds ratio of (i) all preterm births and (ii) restricted to one preterm birth per woman with increasing depth of excision (trend) stratified by timing of colposcopy relative to the birth. Interaction between depth of treatment and timing of colposcopy in relation to the birth for (A) first births post colposcopy versus births before colposcopy; (B) second+ birth post colposcopy versus first births post colposcopy and (C) second+ births post colposcopy versus births before colposcopy.
