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Table 2 Means and standard deviations of test performance in doctors under investigation compared to volunteer doctors

From: Are the General Medical Council’s Tests of Competence fair to long standing doctors? A retrospective cohort study

  Mean score knowledge test Mean score overall OSCE Mean score basic life support Mean score communication Mean score physical examination
Doctors under investigation (n = 95) 77(SD = 16.9) 327 (SD = 96.8) 22(SD = 14.7) 27(SD = 13) 27(SD = 13.3)
Volunteer doctors (n = 376) 80(SD = 10.9) 437 (SD = 31.7) 35(SD = 6.5) 36(SD = 6.8) 37(SD = 5.4)
T-test t(469) = −2.3, p = 0.02 t(469) = 18.5, p < 0.001 t(469) = −13.6, p < 0.001 t(469) = −9.6, p < 0.001 t(469) = −12.1, p < 0.001
Standardized mean differences Cohen’s d = −0.21 Cohen’s d = −1.53 Cohen’s d = −1.14 Cohen’s d = −0.87 Cohen’s d = −0.99
  Effect size r = −0.1 Effect size r = −0.61 Effect size r = −0.5 Effect size r = −0.4 Effect size r = −0.44