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

Table 5 Baseline characteristics and odds ratios (OR) of invasive breast cancer in the nested case-control study

Characteristics	Categories	Cases (N=439)	Controls (N=1,198)	Adjusted OR (CI)	P
AGECAT (y)	< 50	2	11	1.00 (referent)	0.317
	≥ 50	437	1187	2.19 (0.47 to 10.13)
AGEMEN (y)	≥ 14	246	772	1.00 (referent)	0.039
	12 – 13	173	377	1.23 (1.01 to 1.49)
	< 12	20	49	1.51 (1.24 to 1.83)
AGEFLB (y)	< 20	56	187	1.00 (referent)	0.015
	20 – 24	132	440	1.19 (1.04 to 1.37)
	25 – 29 or nulliparous	185	425	1.42 (1.23 to 1.64)
	≥ 30	66	144	1.69 (1.47 to 1.95)
NUMREL	0	411	1162	1.00 (referent)	0.002
	1	25	36	2.15 (1.31 to 3.52)
	≥ 2	3	0	4.62 (2.82 to 7.56)
NBIOPS	0	398	1119	1.00 (referent)	0.234
	≥ 1	41	79	1.28 (0.85 to 1.94)
ETHNICITY	Chinese	377	1051	1.00 (referent)
	Malay	15	29	0.96 (0.58 to 1.59)	0.868
	Indian	25	65	1.30 (0.67 to 2.50)	0.434
	Others	22	53	1.02 (0.60 to 1.74)	0.936
BMI (kg/m²)	< 23.0	126	476	1.00 (referent)	<0.001
	23.0 – 27.4	207	497	1.43 (1.22 to 1.68)
	≥ 27.5	106	223	2.04 (1.73 to 2.39)
PARITY	≥ 3	263	801	1.00 (referent)	0.031
	1 – 2	112	276	1.22 (1.02 to 1.46)
	0	64	121	1.49 (1.24 to 1.79)
OC	No	278	743	1.00 (referent)	0.894
	Yes	161	455	1.02 (0.80 to 1.29)
HRT	No	364	1022	1.00 (referent)	0.265
	Yes	75	173	1.19 (0.88 to 1.62)
SMOKING	No	415	1126	1.00 (referent)	0.831
	Yes	24	72	1.05 (0.98 to 1.72)
WHR	≤ 0.85	293	863	1.00 (referent)	0.074
	> 0.85	146	335	1.25 (0.98 to 1.60)

ISSN: 1471-2407