Table 3.

Radiologists’ performance on key staging parameters and prognostic factors in rectal MRI, stratified by performance status

	Low performance group (n=9)				Adjusted OR (95% CI)	High performance group (n=9)				Adjusted OR (95% CI)
	Baseline		End of course			Baseline		End of course
All cases (n=30)
Tumour category*	62%	(158/255)	77%	(202/264)	2.60 (1.68 to 4.02)	75%	(202/269)	76%	(204/269)	1.05 (0.67 to 1.63)
Tumour stage, early vs advanced†	86%	(220/255)	89%	(235/263)	1.50 (0.82 to 2.73)	93%	(247/266)	94%	(252/268)	1.27 (0.61 to 2.63)
Tumour height category	74%	(192/260)	81%	(214/265)	1.75 (1.08 to 2.86)	83%	(223/268)	84%	(226/269)	1.10 (0.63 to 1.93)
Tumour location	1.76	±0.30	1.33	±0.39	0.42 (0.19 to 0.64)	1.29	±0.60	0.94	±0.39	0.35 (0.13 to 0.57)
Lymph node status	86%	(221/256)	89%	(235/263)	1.40 (0.80 to 2.43)	86%	(231/268)	81%	(218/268)	0.63 (0.37 to 1.07)
EMVI status	79%	(182/229)	79%	(199/251)	0.98 (0.58 to 1.65)	78%	(198/254)	87%	(232/267)	2.36 (1.38 to 4.04)
Cases with T3 or T4 tumours (n=19)
Tumour-free MRF, 5 mm level	49%	(33/68)	76%	(50/66)	10.80 (3.75 to 31.17)	88%	(58/66)	87%	(59/68)	0.83 (0.23 to 3.00)
Tumour-free MRF, 1 mm level	68%	(52/77)	87%	(65/75)	6.89 (2.56 to 18.52)	91%	(68/75)	89%	(68/76)	0.84 (0.24 to 2.93)

Data are percentages (number/total) and OR for agreeing with the reference standard (95% CI), except for tumour location, which is the difference between the clock face centre of the tumour derived from the participants’ registrations compared with the ones derived from the reference standard, expressed as means (hours), SD and difference of means from baseline to end of course (95% CI).

*Tumour category: T1, T2, T3, T4.

†Early tumours: T1, T2, T3a–b; advanced tumours: T3c–d, T4a–b.

EMVI, extramural vascular invasion; MRF, mesorectal fascia.