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Table 1 Characteristics of patients with one-year follow-up completed

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

 No follow-up
(n = 2104)
Follow-up
(n = 3481)
p-value
Age (years)Mean (SD)62.8 (15.9)62.6 (16)0.689
GenderFemale1561 (44.8)967 (46.0)0.417
Male1920 (55.2)1137 (54.0) 
ASA GradeASA I-II2176 (67.0)1312 (68.5)0.279
ASA III-V1071 (33.0)604 (31.5) 
Operative urgencyElective2752 (79.1)1687 (80.2)0.314
Emergency729 (20.9)417 (19.8) 
RCRI score< 33328 (95.7)2014 (96.0)0.491
≥3151 (4.3)83 (4.0) 
Operative approachLaparoscopic1339 (38.5)1006 (48.0)< 0.001
Open/ laparoscopic converted to open2136 (61.5)1090 (52.0) 
Operative contaminationClean-contaminated3234 (93.2)1928 (91.9)0.065
Contaminated235 (6.8)170 (8.1) 
AKI within 7 days of index surgeryNo AKI2979 (85.6)1837 (87.3)0.060
AKI443 (12.7)225 (10.7) 
Missing59 (1.7)42 (2.0) 
  1. AKI Acute Kidney Injury, ASA American Society of Anaesthesiologists, RCRI Revised Cardiac Risk Index