Table 2.

Association of BMI with all-cause mortality

	BMI (kg/m2)1
	<18.5	18.5–24.9	25.0–29.9	30.0–34.9	≥35.0
All individuals
Deaths	84	335	184	93	83
Person-years	4931	25,796	12,831	7688	6056
Individuals	861	4412	2167	1284	1004
HR (95% CI)2	1.37 (1.12 –1.69 )	1 (reference)	0.80 (0.69 –0.92 )	0.75 (0.60 –0.93 )	0.80 (0.64 –1.02 )
Males
Deaths	52	179	56	18	5
Person-years	3073	11,423	1815	608	271
Individuals	528	1963	325	106	46
HR (95% CI)2	1.27 (0.95 –1.69 )	1 (reference)	0.85 (0.66 –1.11 )	0.82 (0.57 –1.19 )	0.88 (0.46 –1.69 )
Females
Deaths	32	156	128	75	78
Person-years	1857	14,373	11,015	7080	5785
Individuals	333	2449	1842	1178	958
HR (95% CI)2	1.64 (1.25 –2.13 )	1 (reference)	0.79 (0.66 –0.94 )	0.76 (0.58 –0.99 )	0.84 (0.64 –1.10 )
Excluding first 2 years of follow-up
Deaths	84	335	184	93	83
Person-years	4931	25,796	12,831	7688	6056
Individuals	861	4412	2167	1284	1004
HR (95% CI)2	1.34 (1.04 –1.71 )	1 (reference)	0.85 (0.72 –1.01 )	0.84 (0.65 –1.09 )	0.93 (0.70 –1.22 )
HIV negative
Deaths	33	140	82	42	38
Person-years	2671	12761	6996	4956	4248
Individuals	644	3053	1437	933	776
HR (95% CI)2	1.21 (0.89 –1.65 )	1 (ref)	0.76 (0.62 –0.94 )	0.67 (0.48 –0.91 )	0.65 (0.46 –0.92 )
HIV positive
Deaths	26	131	52	25	20
Person-years	1055	6994	3850	1800	1095
Individuals	211	1394	720	341	213
HR (95% CI)2	1.33 (0.98 –1.81 )	1 (ref)	0.73 (0.57 –0.94 )	0.71 (0.49 –1.03 )	0.96 (0.65 –1.41 )
HIV unknown
Deaths	25	64	50	26	25
Person-years	1205	6042	1985	932	712
Individuals	351	1676	547	283	206
HR (95% CI)2	1.74 (1.21 –2.48 )	1 (ref)	0.94 (0.70 –1.26 )	0.99 (0.63–1.55 )	1.03 (0.64 –1.64 )
Unweighted for non-response
HR (95% CI)3	1.39 (1.15 –1.67 )	1 (reference)	0.80 (0.69 –0.91 )	0.75 (0.61 –0.92 )	0.81 (0.64 –1.01 )

All individuals	<18.5	18.5–<20.0	20.0– <22.5	22.5– <25.0	25.0–29.9	30.0–34.9	≥35
Deaths	84	62	145	128	184	93	83
Person-years	4931	5005	11398	9393	12831	7688	6056
Individuals	861	861	1938	1613	2167	1284	1004
HR (95% CI)2	1.37 (1.12 –1.69 )	1.20 (1.08 –1.33 )	1 (reference)	0.91 (0.88 –0.95 )	0.80 (0.69 –0.92 )	0.80 (0.60 –0.93 )	0.80 (0.64 –1.02 )

¹BMI modelled as a continuous covariate by restricted cubic splines with 4 knots; deaths / person-years in each group shown for information only. HRs are presented at selected values of BMI, comparing the median value in each BMI group to BMI 22 as the reference.

²HRs estimated from Cox regression; adjusted for current age (as timescale), sex, HIV status and socioeconomic status. Models were weighted to account for non-response in the 2010 survey.

³HRs estimated from Cox regression as described in footnote 2, but unweighted for non-response.