Table 2. Relative risk for lung cancer by selected characteristics at reference datea.

	Lung cancer		Controls
	N	%	N	%	ORb (95% CI)	Smoking-adjusted ORc (95% CI)
Overall	68		337
Smoking status
Never	2	3.8	71	27.1	1
Former	6	11.5	63	24.0	3.22 (0.63–16.6)
Current	44	84.6	128	48.9	14.4 (3.36–62.1)
Unknown	16		75
Pack-yearsd
<30	16	36.4	62	50.8	11.5 (2.42–54.6)
⩾30	28	63.6	60	49.2	15.9 (3.67–69.1)
Unknown	0		6
History of cART use
Never	18	26.5	77	22.8	1	1
Ever	50	73.5	260	77.2	0.67 (0.29–1.52)	0.73 (0.31–1.70)
History of AIDS-defining disease
No	54	79.4	229	68.0	1	1
Yes, without pulmonary diseasee	8	11.8	62	18.4	0.53 (0.24–1.18)	0.60 (0.27–1.36)
Yes, with pulmonary diseasee	6	8.8	46	13.6	0.49 (0.19–1.28)	0.62 (0.22–1.72)
Nadir CD4+ cell count, cells per μl
⩾200	31	45.6	142	42.4	1	1
50–199	26	38.2	124	37.0	0.96 (0.54–1.71)	1.07 (0.57–2.02)
<50	11	16.2	69	20.6	0.73 (0.34–1.55)	0.87 (0.39–1.90)
Unknown	0		2

Abbreviations: cART=combined antiretroviral therapy; CI=confidence interval; OR=odds ratio.

^aSee the ‘Materials and Methods’ section for definition of reference date.

^bConditioned upon matching variables.

^cConditioned upon matching variables and adjusted for smoking status (never/former, current with <30 pack-years, current with ⩾30 pack-years, unknown).

^dCurrent smokers only.

^eIncludes recurrent bacterial pneumonia, pulmonary tuberculosis, or Pneumocystis carinii pneumonia.