# Table 4

Correlations in the 1985 Cohort Studya,b,c, d,e
Mean GCSE/O-level grade Best three A-levels BMS outcome Finals outcome On Specialist Register
Continuous censored Continuous censored Ordinal Continuous Binary
Mean GCSE/O-level grade 1 0.381 0.214 0.222 0.067
P<0.001 P<0.001 P<0.001 P = 0.071
n = 848 n = 843 n = 348 n = 731
Best three A-levels 0.390 ± 0.031 (0.327 to 0.446) 1 0.180 0.240 0.066
P<0.001 P<0.001 P = 0.075
n = 848 n = 347 n = 733
BMS outcome 0.242 ± 0.033 (0.184 to 0.314) 0.216 ± 0.037 (0.147 to 0.290) 1 0.350 0.096
P<0.001 P = 0.009
n = 361 n = 742
Finals outcome (London only) 0.234 ± 0.046 (0.140 to 0.323) 0.254 ± 0.055) (0.148 to 0.362) 0.411 ± 0.054 (0.282 to 0.508) 1 0.214
P<0.001
n = 334
On Specialist Register 0.088 ± 0.045 (0.003 to 0.174) 0.089 ± 0.042 (0.012 to 0.175) 0.129 ± 0.051 (0.030 to 0.226) 0.267 ± 0.062 (0.136 to 0.385) 1

Abbreviations: A-level, Advanced level; BMS, Basic medical sciences; GCSE, General Certificate of Secondary Education; MCMC, Markov Chain Monte Carlo; O-level, Ordinary level.

aCorrelations in entrants to medical school between measures of academic and professional attainment attainment in the 1985 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