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Table 1 Patient demographics of infants undergoing PDA ligation in the 3 centres – Centre A – Cambridge, Centre B – Guys and St Thomas, Centre C – Great Ormond Street. Results are expressed as median (95% confidence interval).

From: Outcome following patent ductus arteriosus ligation in premature infants: a retrospective cohort analysis

Demographic Centre A n = 21 Centre B n = 35 Centre C n = 28 p value*
Birth weight (grams) Median (95% CI) 820 (649–1020) 770 (710–840) 807 (728–980) 0.67
Birth gestation (weeks) Median (95% CI) 27 (24–28) 25 (25–26) 26 (25–27) 0.32
Ligation weight (grams) Median (95% CI) 963 (781–1169) 1050 (910–1170) 950 (795–1100) 0.66
Ligation age (days) Median (95% CI) 23 (20–31) 31 (25–41) 27 (21–30) 0.05
  1. *Kruskall Wallis test