Table 2.

Comparison of cohort effect on correct diagnoses, based on logistic regression^a

	TC	UPC	UHC
Proportion of correct diagnoses per cohort, n/n (%)	296/421 (70·3%)	231/411 (56·2%)	288/558 (51·6%)
Comparison between cohorts	OR	95% CI	P‐value
TC vs. UPC, mixed‐model LR	1·882	1·390–2·584	< 0·001
TC vs. UPC, standard LR	1·845	1·387–2·456	< 0·001
TC vs. UHC, standard LR	2·000	1·700–2·899	< 0·001
UPC vs. UHC, standard LR	1·203	0·931–1·554	0·157

^aReferral letters without a diagnosis mentioned were excluded from this analysis.

CI, confidence interval; LR, logistic regression; OR, odds ratio; TC, trained cohort; UHC, untrained historical cohort; UPC, untrained present cohort