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Table 3 Classification of perineal tears

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

Description 2nd degree 3rd degree 4th degree Not defined
  Consultant Trainee Consultant Trainee Consultant Trainee Consultant Trainee
EAS exposed 579 (86.2%) 128 (86.5%) 20 (3%) 07 (4.7%) - - 73 (10.8%) 13 (8.8%)
EAS partly torn 220 (32.7%) 32 (21.6%) 399 (59.4%) 110 (74.3%) 10 (1.5%) 1 (0.7%) 43 (6.4%) 05 (3.4%)
EAS completely torn 85 (12.6%) 10 (6.6%) 518 (77.1%) 127 (85.8%) 36 (5.4%) 05 (3.4%) 33 (4.9%) 06 (4.0%)
IAS exposed 193 (28.7%) 34 (22.9%) 380 (56.5%) 92 (62.2%) 31 (4.6%) 08 (5.4%) 68 (10.1%) 14 (9.5%)
IAS torn 51 (7.6%) 06 (4%) 413 (61.4%) 95 (64.2%) 147 (21.9%) 34 (22.9%) 61 (9.1%) 13 (8.8%)
AS & Mucosa Torn 05 (0.7%) - 162 (24.1%) 04 (2.7%) 474 (70.6%) 135 (91.2%) 31 (4.6%) 09 (6.1%)
AS intact but mucosa torn 74 (11%) 09 (6.1%) 178 (26.4%) 08 (5.4%) 280 (41.8%) 96 (64.9%) 140 (20.8%) 35 (23.6%)