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77 Maternity and Obstetrics Table II: The contribution that each group makes to the overall hospital population (percentages) Year 1974 1984 1994 2014 2015 2016 2017 2018 2019 2020 1 26.7% 29.1% 28.4% 23.0% 22.3% 21.8% 20.3% 20.2% 18.7% 17.7% 2 7.4% 4.9% 9.1% 15.9% 16.8% 16.6% 17.5% 16.7% 19.6% 21.1% 2a 14.4% 15.3% 15.1% 15.9% 14.5% 17.0% 18.4% 2b 1.4% 1.5% 1.5% 1.7% 2.2% 2.6% 2.7% 3 42.6% 48.2% 39.5% 29.1% 28.6% 27.0% 26.4% 27.2% 24.7% 21.6% 4 12.8% 7.2% 10.0% 11.2% 11.7% 12.5% 12.8% 13.3% 13.4% 15.3% 4a 10.3% 10.7% 11.4% 11.8% 11.8% 12.0% 13.6% 4b 1.0% 1.0% 1.1% 1.0% 1.4% 1.3% 1.7% 5 2.6% 4.3% 5.1% 10.8% 12.7% 12.1% 11.7% 12.2% 13.0% 13.5% 6 1.1% 1.0% 1.6% 2.3% 2.4% 1.9% 2.7% 2.3% 2.4% 2.1% 7 1.4% 1.3% 1.2% 1.4% 1.5% 1.4% 1.7% 1.6% 2.0% 1.8% 8 1.2% 1.2% 1.2% 2.2% 2.3% 2.1% 2.3% 1.4% 1.6% 1.9% 9 0.3% 0.3% 0.2% 0.3% 0.4% 0.3% 0.4% 0.5% 0.4% 0.6% 10 3.9% 2.5% 3.6% 3.8% 4.5% 4.3% 4.3% 4.6% 4.2% 4.5% Comment: The sizes and ratios of Group 1: Group 2 reflect the changing incidence of induction and pre labour caesarean section. This is a change of clinical practice partly at least as a result of changing epidemiological variables. Table III: The caesarean section rate within each of the 10 groups (percentages) Year 1974 1984 1994 2014 2015 2016 2017 2018 2019 2020 Totals 5.0% 4.3% 8.8% 23.5% 25.9% 26.0% 27.2% 28.8% 30.3% 31.4% 1 2.3% 2.8% 4.5% 8.4% 8.7% 7.8% 9.0% 9.7% 8.7% 8.8% 2 12.3% 10.8% 18.3% 37.1% 38.9% 38.7% 38.3% 42.0% 45.1% 42.2% 2a 30.9% 33.1% 32.6% 31.9% 33.5% 36.7% 33.7% 2b 100.0% 100.0% 100.0% 100.0% 98.8% 99.5% 100.0% 3 0.7% 0.4% 1.0% 1.2% 1.6% 1.0% 1.3% 1.7% 1.0% 0.7% 4 9.1% 3.4% 6.1% 13.8% 13.7% 13.0% 12.2% 17.9% 14.4% 15.9% 4a 5.7% 5.7% 4.4% 4.8% 8.1% 4.9% 5.1% 4b 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 5 16.3% 22.3% 33.5% 68.3% 72.9% 76.8% 75.9% 77.6% 79.7% 80.9% 6 32.9% 34.2% 65.0% 94.3% 96.6% 94.7% 96.9% 94.3% 92.1% 94.1% 7 6.7% 14.3% 50.6% 78.9% 93.0% 92.7% 87.9% 86.8% 91.7% 92.5% 8 10.8% 18.8% 31.6% 61.8% 61.0% 63.6% 64.7% 89.3% 67.4% 68.4% 9 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 100.0% 10 19.0% 18.8% 22.4% 36.8% 37.3% 44.1% 45.3% 46.5% 40.9% 41.8% Comment: Caesarean section rates in spontaneous labour (Groups 1 and 3) remain low and consistent. NMH Annual Rep t | 2020