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Table 2 Number of very serious adverse events (death or asphyxia with Apgar < 5 after 5 min, brachial plexus injury or fracture of clavicle/humerus, postpartum hemorrhage ≥2500 mL) obtained from the Medical Birth Registry of Norway and reported in the internal quality assurance and adverse event reporting system of obstetric units according to their size (small < 1000 births per year, medium 1000–1999 births per year, large ≥ 2000 births per year) in 12 Norwegian obstetric units in 2014

From: Adverse events reporting by obstetric units in Norway as part of their quality assurance and patient safety work: an analysis of practice

Size of maternity unit Number of births per year at term Number of adverse events Number of adverse events per 1000 births Number of adverse events reported Number of adverse events reported per 1000 births Number of adverse events related to events reported per 1000 births (%)
< 1000 births per year 2927 14 4.78 (14/2927) 2 0.68 (2/2927) 14.22 (0.68/4.78)
1000–1999 births per year 5907 52 8.80 (52/5907) 18 3.04 (18/5907) 34.54 (3.04/8.80)
>2000 births per year 8489 83 9.77 (83/8489) 9 1.06 (9/8489) 10.84 (1.06/9.77)
  1. Chi-square test: χ2 = 11,8, df = 2, p = 0.003