Table 2

HRs for all-cause mortality according to BMI trajectory groups in the Melbourne Collaborative Cohort Study, overall and in never-smokers

BMI trajectory groups	Overall n=(29 881)*				Never-smokers n=(17 475)†
	Person-years	Deaths	HR	95% CI	Person-years	Deaths	HR	95% CI
All-cause mortality
TR1 Lower-normal stable	72 077	1162	1.00		45 432	604	1.00
TR2 Higher-normal stable	141 989	2507	0.90	0.84 to 0.97	83 881	1220	0.96	0.87 to 1.07
TR3 Normal to overweight	103 976	1826	0.96	0.89 to 1.04	58 515	820	1.00	0.90 to 1.12
TR4 Borderline obesity chronic	11 711	280	1.16	1.01 to 1.33	6210	120	1.25	1.02 to 1.53
TR5 Normal to class I obesity	37 235	600	1.09	0.98 to 1.21	22 762	315	1.19	1.03 to 1.37
TR6 Overweight to class II obesity‡	12 357	187			7838	107
Age 74 years			1.31	1.11 to 1.54			1.42	1.13 to 1.78
Age 80 years			1.19	1.00 to 1.42			1.27	1.02 to 1.59
Age 85 years			1.10	0.88 to 1.38			1.16	0.88 to 1.54

*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=0.04, tested using likelihood ratio test.
BMI, body mass index; MDS, Mediterranean Diet Score; SEIFA, Socio-Economic Indexes For Areas.