Table 5

Correlations in the 1980 Cohort Study
Mean GCSE/O-level grade Best three A-levels First year BMS outcome Second year BMS outcome Finals outcome On Specialist Register
Continuous censored Continuous censored Ordinal Ordinal Continuous Binary
Mean GCSE/O-level grade 1 0.406 0.192 0.209 0.175 -0.022
P<0.001 P<0.001 P<0.001 P = 0.002 NS
n = 562 n = 542 n = 528 n = 313 n = 391
Best three A-levels 0.438 ± 0.035 (0.358 to 0.503) 1 0.190 0.249 0.307 0.045
P<0.001 P<0.001 P<0.001 NS
n = 562 n = 548 n = 328 n = 403
First year BMS outcome 0.226 ± 0.041 (0.130 to 0.298) 0.235 ± 0.042 (0.150 to 0.318) 1 0.416 0.215 0.005
P<0.001 P<0.001 NS
n = 548 n = 329 n = 397
Second year BMS outcome 0.235 ± 0.047 (0.148 to 0.338) 0.293 ± 0.054 (0.174 to 0.379) 0.512 ± 0.038 (0.434 to 0.582) 1 0.359 0.080
P<0.001 NS
n = 329 n = 399
Finals outcome (London only) 0.182 ± 0.051 (0.081 to 0.280) 0.323 ± 0.052 (0.229 to 0.426) 0.244 ± 0.064 (0.107 to 0.357) 0.410 ± 0.052 (0.304 to 0.511) 1 0.084
NS
n = 261
On Specialist Register -0.031 ± 0.062 (-0.146 to 0.090) 0.054 ± 0.063 (-0.064 to 0.176) 0.007 ± 0.079 (-0.142 to 0.156) 0.119 ± 0.077 (-0.052 to 0.255) 0.104 ± 0.074 (-0.038 to 0.250) 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.

aCorrelations in entrants to medical school between measures of academic and professional attainment attainment in the 1980 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.

cCorrelations shown in bold are significant at P<0.05.

dCorrelations 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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