TABLE 2.

Treatment coding agreement by the kappa statistic, by database

	Hosp†	Yes	Yes	No	No
Treatment	MCR†	Yes	No	Yes	No	Kappa
BCS, Definition 13		1,246	23	474	2,213	0.74
BCS, Definition, 24		1,600	57	120	2,179	0.91
Mastectomy		1,969	45	39	1,903	0.96
AND		2,538	36	368	1,014	0.76
	Hosp†	Yes	Yes	No	No
Treatment	Med†	Yes	No	Yes	No	Kappa
BCS, Definition, 13		NA	NA	NA	NA	NA
BCS, Definition, 24		NA	NA	NA	NA	NA
Mastectomy		1,993	21	343	1,599	0.82
AND		2,507	67	360	1,022	0.75
	Med†	Yes	Yes	No	No
Treatment	MCR†	Yes	No	Yes	No	Kappa
Breast Conservation1		NA	NA	NA	NA	NA
Breast Conservation2		NA	NA	NA	NA	NA
Mastectomy		1,991	345	17	1,603	0.82
AND		2,796	71	110	979	0.88

^†Hosp: Hospital records, MCR: Manitoba Cancer Registry, Med: Medical claims

^NANot available

³ICES definition – Codes 85.21–85.23

⁴Current Study definition – Codes 85.21–85.23 and 85.12