Table 1. Distribution of Kaposi's sarcoma and non-Hodgkin's lymphoma cases and controls according to the matching variables.

	Kaposi's sarcoma		Non-Hodgkin's lymphoma
	Cases (N=189)	Controls (N=189)	Cases (N=67)	Controls (N=67)
Sex
Males	189	189	61	61
Females	0	0	6	6
Age (years)
<30	33	38	20	15
30–34	55	53	14	21
35+	101	98	33	31
HIV transmission group
Homosexual	188	188	12	12
Othera	1	1	55	55
Study
Concorde	67	67	20	20
Alpha	56	56	17	17
Delta	66	66	30	30
Ethnicity
White	182	180	64	62
Otherb	7	9	3	5
Mean time (days) between first blood sample and date of diagnosis of cancer/pseudo-diagnosis in controls	923 (standard deviation (s.d.) 725)	965 (s.d. 713)	957 (s.d. 786)	977 (s.d. 795)
Time between 1st and 2nd sample (years)
<2	53	53	30	29
2+	65	65	18	19
NAc	71	71	19	19
CD4 count (at 1st sample)
500–	33	45	4	14
200–	74	84	29	27
<200	56	34	17	9
NKd	26	26	17	17

^aHeterosexual/i.v. drug user/haemophiliac/blood transfusion/other blood contact/other.

^bIndian subcontinent/West Indian-Guyanan/African/other or mixed.

^cNA: not applicable.

^dNK: not known.