A competing risk analysis of colorectal cancer recurrence after curative surgery

BMC Gastroenterology

Table 4 Gray test between pairs of cumulative incidence functions for recurrence

Variable	Groups compared	Gray test p value
Age (years)	< 60 vs 60–74	0.858
	< 60 vs ≥ 75	0.344
	60–74 vs ≥ 75	0.463
Sex	Male vs female	0.247
Tumour location	Colon vs sigmoid/rectosigmoid	0.199
	Colon vs rectum	0.796
	Sigmoid/rectosigmoid vs rectum	0.142
Tumor type	Adenocarcinoma vs mucinous	0.118
Histological grade	Low/well differentiated vs moderate	0.477
	Low/well differentiated vs high/poorly differentiated	0.933
	Moderate vs high/poorly differentiated	0.793
T stage (depth)	T1/ T2 vs T3	0.038
	T1/ T2 vs T4	< 0.001
	T3 vs T4	< 0.001
N stage (nodes)	N0 vs N1	0.119
	N0 vs N2	< 0.001
	N1 vs N2	< 0.001
Vascular invasion	Absent vs present/suspicious	< 0.001
Perineural invasion	Absent vs present	0.076
Positive margins	Uninvolved vs positive margin	0.001
Nodes examined	< 12 vs ≥ 12	0.852
Post-operative adjuvant therapy	None vs chemotherapy and/or radiation	< 0.001

ISSN: 1471-230X