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Table 2 Demographic and anthropometric characteristics of patients used to develop the reference chart (development set) vs. patients used to examine the performance of the reference chart (test set). Values are presented as mean ± standard deviation unless otherwise reported

From: Reference chart for knee flexion following total knee arthroplasty: a novel tool for monitoring postoperative recovery

  Development Set Test Set t-test (CHI2)
n = 327 (1173 obs) n = 171 (377 obs) p-value
Age (yrs) 64.3 ± 9.4 64.9 ± 13.5 0.72
BMI (kg/m2) 32.9 ± 6.6 31.4 ± 7.9 0.23
Sex distribution (% female) 57.1 55.7 (0.8)
  1. Abbreviations: BMI Body Mass Index, obs observations