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Table 3 Number of obstetric adverse events (birth asphyxia, shoulder dystocia, severe postpartum hemorrhage) obtained from the Medical Birth Registry of Norway and events reported and analyzed in the internal quality assurance and adverse event reporting system in 12 Norwegian obstetric units in 2014, grouped into those selected by the supervisory authorities for a closer surveillance (n = 6 units) and those randomly allocated to a control group (n = 6 units). Chi-squared test with Yates correction

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

Type of maternity unit Total number of births at term Total number of adverse events, n (%) Adverse events reported, n (%) Number of adverse events with adequate assessment, n (%)
Six maternity units selected by the supervisory authorities as high-risk 7720 215 (2.78) 15 (6.97) 6 (40.00 %)
Six maternity units allocated randomly as a control group 9603 309 (3.21) 32 (10.35) 17 (53.12 %)
Chi2, df   2.7324, 1 2.5609, 1 2.4781, 1
p-value   > 0.10 > 0.10 > 0.10