Table 3

HRs for all-cause mortality according to BMI trajectory groups in the Melbourne Collaborative Cohort Study, overall and in never-smokers, excluding participants who did not attend 2003–2007 data collection

BMI trajectory groups	Overall* n=(21 903)				Never-smokers† n=(13 253)
	Person-years	Deaths	HR	95% CI	Person-years	Deaths	HR	95% CI
TR1 Lower-normal stable	52 878	655	1.00		34 655	358	1.00
TR2 Higher-normal stable	96 021	1283	0.88	0.80 to 0.97	58 420	632	0.91	0.80 to 1.03
TR3 Normal to overweight	65 825	902	0.98	0.88 to 1.09	38 118	438	1.04	0.90 to 1.20
TR4 Borderline obesity chronic	6624	124	1.21	0.99 to 1.47	3643	65	1.36	1.04 to 1.79
TR5 Normal to class I obesity	22 598	280	1.13	0.98 to 1.30	14 114	164	1.22	1.01 to 1.48
TR6 Overweight to class II obesity‡	7125	83			4768	50
Age 74 years			1.43	1.13 to 1.83			1.61	1.17 to 2.20
Age 80 years			1.08	0.84 to 1.39			1.19	0.86 to 1.65
Age 85 years			0.85	0.62 to 1.17			0.93	0.62 to 1.39

*Adjusted for age, birth cohort, height, sex, country of birth, SEIFA, highest level of education, smoking status at latest BMI assessment, baseline MDS, alcohol drinking status and physical activity score.
†Adjusted for age, birth cohort, height, sex, country of birth, SEIFA, highest level of education, baseline MDS, alcohol drinking status and physical activity score.
‡The p refers interaction between TR6 and attained age=0.0002 for overall and 0.003 for never-smokers, tested using likelihood ratio test.
BMI, body mass index; MDS, Mediterranean Diet Score; SEIFA, Socio-Economic Indexes For Areas.