Modelling excess mortality among breast cancer patients in the North East Region of Peninsular Malaysia, 2007–2011: a population-based study

Table 2 Univariable Poisson regression of breast cancer cases in Kelantan Cancer Registry (n = 549)

Variables	β coefficient (SE)	Crude EHR (95% CI)	Z statistics	P-value
Age at diagnosis^a
> 50	0.00	1.00
≤ 50	0.37 (0.15)	1.44 (1.08, 1.93)	2.47	0.014
Ethnicity^a
Non-Malay	0.00	1.00
Malay	1.28 (0.35)	3.58 (1.81, 7.07)	3.675	< 0.001
Stages^a
Stage І	0.00	1.00
Stage ІІ	−0.65 (0.30)	0.52 (0.29, 0.94)	−2.15	0.031
Stage ІІІ	0.82 (0.23)	2.28 (1.46, 3.54)	3.65	< 0.001
Stage IV	1.89 (0.20)	6.60 (4.50, 9.69)	9.65	< 0.001
Morphology^a
Others	0.00	1.00
Infiltrating ductal carcinoma, NOS	−0.38 (0.17)	0.69 (0.49, 0.96)	−2.20	0.028
Surgery^a
No	0.00	1.00
Yes	−0.84 (−0.15)	0.43 (0.32, 0.58)	−5.61	< 0.001
Radiotherapy^b
No	0.00	1.00
Yes	−0.43 (−0.20)	0.65 (0.44, 0.96)	−2.15	0.031
Chemotherapy^b
No	0.00	1.00
Yes	0.20 (0.15)	1.23 (0.92, 1.64)	1.37	0.170

^aTime interval used (in year): 0.00, 0.08, 0.17, 0.25, 0.33, 0.42, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 7.00, 8.00, 9.00, 10.00
^bTime interval used (in year): 0.00, 0.08, 0.17, 0.25, 0.33, 0.42, 0.50, 0.75, 1.00, 1.25, 1.50, 1.75, 2.00, 2.50, 3.00, 3.50, 4.00, 4.50, 5.00, 5.50, 6.00, 7.00, 10.00
EHR excess hazard ratio, NOS not otherwise specified

ISSN: 1471-2458