Table 1

Descriptive statistics for predictor-outcome correlations and criterion-related construct validities
Predictor-outcome correlations Criterion-related construct validities
N participants Pearson Corrected* r Equivalent N
N studies Mean (Range) Mean (Range) Mean (Range) Mean (Range) Mean (Range)
Predictor
A-levels 22 920 (R 55; 3,096) .180 (R .041; .306 ) .231 (R .053; .415) .634 (R .147; .943) 61 (R 8; 245)
AS-levels 1 1911 .182 .228 .458 266
GCSEs/O-levels 20 849 (R 52; 2,657) .162 (R -.026 ; .269) .176 (R −.045; .273) .336 (R −.079; .626) 231 (R 16; 1,271)
Highers 1 777 -.001 .076 .107 336
‘HighersPlus’ 1 771 .143 .180 .292 265
Advanced Highers 1 735 .345 .358 .506 247
Ed. Attainment GCE 1 2768 .312 .347 .923 745
Ed. Attainment SQA 1 722 .419 .425 .623 317
Aptitude tests (AH5, UKCAT) 9 934 (R 156; 4,841) .132 (R .037; .276) .152 (R .045; .260) .228 (R.062; .449) 445 (R 62; 2,720)
Outcome
BMS first year 15 1521 (R 542; 4,841) .207 (R −.001 ; .419) .248 (R .076; .425) .498 (R .107; .943) 517 (R 24; 2,720)
BMS overall 9 1152 (R 502; 3,096) .174 (R .037; .282) .215 (R .053; .394) .491 (R .065; .903) 203 (R 10; 513)
Finals 11 786 (R 314; 2,413) .187 (R .051 ; .306) .222 (R .080; .328) .488 (R.097; .871) 136 (R 10; 389)
MRCP(UK) Pt1 5 492 (R 202; 957) .192 (R .126; .245) .221 (R .143; .308) .456 (R .168; .692) 107 (R 32; 209)
MRCP(UK) Pt2 5 363 (R 98; 753) .205 (R .085 ; .299) .227 (R .071; .217) .442 (R .326; .743) 44 (R 12; 80)
MRCP(UK) Clinical 5 277 (R 52; 597) .141 (R .058; .236) .144 (R .071; .217) .317 (R .147; .627) 40 (R 10; 81)
On Specialist Register 9 984 (R 393; 2,664) .084 (R -.026; .419) .113 (R −.045; .249) .367 (R −.079; .803) 126 (R 8; 2,720)
Cohort
Westminster 4 470 (R 454; 486) .169 (R .146 ; .190) .226 (R .188; .249) .565 (R .386; .803) 49 (R 17; 96)
1980 cohort 8 449 (R 314; 562) .164 (R −.026; .306) .192 (R −.046; .315) .457 (R −.079; .864) 73 (R 14; 178)
1985 cohort 6 643 (R 347; 851) .164 (R .066 ; .240) .187 (R .102; .253) .566 (R .214; .903) 98 (R 8; 289)
1990 cohort 18 1234 (R 156; 3,096) .133 (R .037; .276) .157 (R .045; .280) .357 (R .062; .692) 190 (R 42; 513)
UCLMS cohorts 12 362 (R 52; 668) .218 (R .058; .299) .261 (R .071; .415) .475 (R .147; .743) 96 (R 10; 346)
UKCAT-12 9 1,938 (R 722; 4841) .198 (R −.001; .419) .232 (R .076; .425) .467 (R .107; .943) 688 (R 25; 2720)
All construct validities 57 935(SD = 956) (R 52; 4841) .171(SD = .092) (R .−026; .419) .203(SD = .101) (R −.045; .425) .450(SD = .248) (R −.079; .943) 213(SD = 396) (R 8; 2720)

*The corrected correlation takes into account both right-censoring and the use of ordinal values (see statistical appendix for details).

Note that figures in brackets are ranges (indicated by R:) and are not confidence intervals.

McManus et al.

McManus et al. BMC Medicine 2013 11:243   doi:10.1186/1741-7015-11-243

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