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Table 2 OAKS centre characteristics, centre activity and data completeness at one-year postoperatively

From: Challenges of one-year longitudinal follow-up of a prospective, observational cohort study using an anonymised database: recommendations for trainee research collaboratives

 Centre active in OAKSCentre ≥95% completeness in OAKS
Active (n = 126)Inactive (n = 47)p-valueYes (n = 73)No (n = 53)p-value
UK CountriesEngland95 (72.5)36 (27.5)0.04553 (55.8)42 (44.2)< 0.001
Ireland11 (78.6)3 (21.4) 4 (36.4)7 (63.6) 
Scotland16 (88.9)2 (11.1) 16 (100.0)0 (0.0) 
Wales4 (40.0)6 (60.0) 0 (0.0)4 (100.0) 
Total number of patients to be followed up< 15 patients31 (70.5)13 (29.5)0.49124 (77.4)7 (22.6)0.030
15–29 patients39 (72.2)15 (27.8) 23 (59.0)16 (41.0) 
30–59 patients37 (69.8)16 (30.2) 19 (51.4)18 (48.6) 
> 60 patients19 (86.4)3 (13.6) 7 (36.8)12 (63.2) 
Percentage of patients with complete follow-upMean (SD)28.3 (21.6)27.9 (21.9)0.877
Junior doctor present in OAKS mini-teamaYes108 (80.6)26 (19.4)< 0.00163 (58.3)45 (41.7)0.825
No18 (46.2)21 (53.8) 10 (55.6)8 (44.4) 
Central storage of patient hospital identifiersYes51 (83.6)10 (16.4)0.01937 (72.5)14 (27.5)0.006
No75 (67.0)37 (33.0) 36 (48.0)39 (52.0) 
Survey respondentsYes125 (84.5)23 (15.5)< 0.00172 (57.6)53 (42.4)0.392
No1 (4.0)24 (96.0) 1 (100.0)0 (0.0) 
  1. aJunior doctors are present in each mini-team over a data collection period