Table 6

Correlations in the Westminster Cohort Study
AH5 score Best three A-levels Clinical performance PRHO ratings MRCP(UK) Part 1 On Specialist Register
Continuous Continuous censored Ordinal Continuous censored Ordinal Binary
AH5 score 1 0.281 0.155 0.074 -0.162 0.185
P<0.001 P = 0.001 NS NS P<0.001
n = 501 n = 486 n = 408 n = 106 n = 458
Best three A-levels 0.299 ± 0.041 (0.223 to 0.377) 1 0.146 0.078 0.098 0.190
P = 0.001 NS NS P<0.001
n = 483 n = 405 n = 105 n = 454
Clinical performance 0.209 ± 0.065 (0.079 to 0.336) 0.202 ± 0.057 (0.091 to 0.312) 1 0.175 0.174 0.126
P<0.001 NS P = 0.008
n = 395 n = 104 n = 447
PRHO ratings 0.069 ± 0.048 (-0.037 to 0.163) 0.086 ± 0.054 (-0.020 to 0.190) 0.260 ± 0.063 (0.141 to 0.400) 1 0.093 0.076
NS NS
n = 83 n = 372
MRCP(UK) Part 1 -0.154 ± 0.101 (-0.351 to 0.036) 0.138 ± 0.107 (-0.079 to 0.346) 0.302 ± 0.143 (-0.004 to 0.562) 0.124 ± 0.110 (-0.105 to 0.323) 1 0.261
P = 0.009
n = 98
On Specialist Register 0.229 ± 0.061 (0.109 to 0.348) 0.245 ± 0.062 (0.108 to 0.353) 0.215 ± 0.077 (0.065 to 0.363) 0.096 ± 0.069 (-0.042 to 0.231) 0.325 ± 0.129 (0.053 to 0.572cpa) 1

Abbreviations: A-level, Advanced level; BMS, Basic medical sciences; GCSE, General Certificate of Secondary Education; MCMC, Markov Chain Monte Carlo; NS, not significant; O-level, Ordinary level; PRHO, Pre-Registration House Officer.

aCorrelations in entrants to medical school between measures of academic and professional attainment in the Westminster Cohort study.

bCorrelations above the diagonal are simple Pearson correlations (for example, point-biserials, φ correlations, where a measure is binary or ordinal), and have different N values for various reasons.

Correlations shown in bold are significant at P<0.05.

Correlations in the lower triangle were calculated taking account of censoring, and for ordinal values are equivalent to tetrachoric/polychoric correlations.

eValues are mean ± SD (95% CI) unless otherwise stated, and the 95% confidence intervals are the result of the final 2000 MCMC steps in a chain of 5000.

McManus et al.

McManus et al. BMC Medicine 2013 11:242   doi:10.1186/1741-7015-11-242

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