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Table 4 Geographical variation in the definition of OASI

From: Management of obstetric anal sphincter injury: a systematic review & national practice survey

Health Region EAS part torn = 2° – Yes EAS completely torn = 2° – Yes EAS complete or partially torn= 2° – Yes
Scotland 29/65 (44.6) 12/65 (18.4) 41/65 (63)
Northern 11/29 (37.9) 09/29 (31) 20/29 (68.9)
Northern Ireland 18/35 (51.4) 06/35 (17.1) 24/35 (68.5)
Republic of Ireland 06/22 (27.2) 02/22 (9.1) 08/22 (36.3)
York 08/43 (18.6) 03/43 (6.9) 11/43 (25.5)
North Western 01/07 (14.2) 02/07 (28.5) 03/07 (42.8)
Mersey 14/54 (26) 08/54 (14.8) 22/54 (40.7)
Trent 18/47 (38.2) 10/47 (21.2) 28/47 (59.5)
West midlands 22/63 (34.9) 07/63 (11.1) 29/63 (46)
Wales 12/36 (33.3) 04/36 (11.1) 16/36 (44.4)
Anglia 12/32 (37.5) 04/32 (12.5) 16/32 (50)
Oxford 06/19 (31.5) 02/19 (10.5) 08/19 (42)
North East Thames 13/43 (30.2) 04/43 (9.3) 17/43 (39.5)
North West Thames 05/28 (17.8) 01/28 (33.6) 06/28 (21.4)
South East Thames 13/45 (28.8) 04/45 (8.8) 17/45 (37.8)
South West Thames 11/32 (34.3) 02/32 (6.3) 13/32 (40.6)
Wessex 08/29 (27.5) 01/29 (3.4) 09/29 (30.9)
South west 13/43 (30.2) 04/43 (9.3) 17/43 (39.5)
Total 220/672 (32.7) 85/672 (12.6) 305/672 (45.3)