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Table 1 Distribution of the characteristics of patients who underwent surgery in the Amsterdam cohort between April 1997 and January 1999 and patients who underwent surgery in the Utrecht cohort between February and December 2004; % (n) unless stated otherwise

From: A simple method to adjust clinical prediction models to local circumstancesUne méthode simple pour ajuster les modèles de prédiction clinique aux circonstances locales

Patient characteristics Amsterdam cohort 1997–1999 (n = 1944) Utrecht cohort 2004 (n = 1035)
Female gender 57 (1110) 58 (596)
Age (years)a 43 (15) 47 (16)
Preoperative pain score (NRS)a 3.0 (2.7) 3.4 (2.9)
Type of surgery   
    Lowest expected incidence of pain 4 (72) 9 (92)
    Low expected incidence of pain 30 (590) 29 (297)
    Medium expected incidence of pain 18 (348) 19 (200)
    High expected incidence of pain 35 (671) 33 (339)
    Highest expected incidence of pain 14 (263) 10 (107)
Ambulatory surgery 28 (549) 43 (444)
Expected incision size ≥10 cm 37 (724) 7 (67)
APAIS anxiety scorea 9.4 (4.0) 9.5 (3.9)
APAIS need for informationa 6.5 (2.2) 6.2 (2.3)
Severe acute postoperative pain, NRS ≥ 6 62 (1205) 36 (374)
  1. NRS numeric rating scale; APAIS Amsterdam preoperative anxiety and information scale. Reprinted with permission from Janssen et al.32
  2. aMean (standard deviation)