Assessing risk of breast cancer in an ethnically South-East Asia population (results of a multiple ethnic groups study)

Table 2 Breast cancer risk factors, and associated regression coefficients ( β ), used in developing the alternative Gail-based models

Risk factor	Categories		BCDDP		GAIL-SBSP	GAIL-SBSP (FULL)	S-GAIL-SBSP	E-GAIL-SBSP
		Code	β	Code	β	β(CI)	β(CI)	β(CI)
*Main effects*
AGECAT (y)	<50	0	0.01081	0	0.01081	0.807	–	–
	≥50	1		1		(–0.73 to 2.35)
AGEMEN (y)	≥14	0	0.09401	0	0.09401	0.240	0.238	0.204
	12–13	1		1		(0.05 to 0.43)	(0.05 to 0.43)	(0.01 to 0.39)
	<12	2		2
AGEFLB (y)	<20	0	0.21863	0	0.21863	0.185	0.183	0.170
	20–24	1		1		(0.016 to 0.31)	(0.06 to 0.31)	(0.03 to 0.31)
	25–29 or nulliparous	2		2
	≥30	3		3
NUMREL	0	0	0.95830	0	0.95830	0.844	0.777	0.774
	1	1		1		(–0.17 to 1.86)	(0.30 to 1.26)	(0.29 to 1.26)
	≥2	2		2
NBIOPS	0	0	0.52926	0	0.52926	−15.877	–	–
	1	1		1		(–16.28 to –15.47)
	≥2	2		1
ATYPICAL	No	0	0.57405*	99	–	–	–	–
	Yes	1		99
BMI (kg/m²)	< 23.0	–	–	0	–	–	–	0.380
	23.0 – 27.4			1				(0.22 to 0.54)
	≥ 27.5			2
PARITY	≥ 3	–	–	0	–	–	–	0.203
	1 – 2			1				(0.03 to 0.38)
	0			2
*Interaction terms*
NBIOPS x AGECAT			−0.28804		−0.28804	16.138	–	–
						(Not estimatable)
AGEFLB x NUMREL			−0.19081		−0.19081	−0.059	–	–
						(–0.61 to 0.50)

ISSN: 1471-2407