AIDS Research and Therapy

Table 1 Characteristics of N = 44,491 participating patients, by year at first presentation

From: CD4 count at presentation for HIV care in the United States and Canada: Are those over 50 years more likely to have a delayed presentation?

	Total		1997		1998		1999		2000		2001		2002		2003		2004		2005		2006		2007		p-value^‡
	N = 44,491		N = 4,479		N = 4,412		N = 4,857		N = 5,262		N = 4,258		N = 4,063		N = 3,688		N = 3,773		N = 3,486		N = 3,354		N = 2,859
Age (years)
18-< 50	35,093	79%	3,698	83%	3,624	82%	3,953	81%	4,244	81%	3,344	79%	3,158	78%	2,855	77%	2,912	77%	2,709	78%	2,516	75%	2,080	73%	< 0.01
≥50	9,398	21%	781	17%	788	18%	904	19%	1,018	19%	914	21%	905	22%	833	23%	861	23%	777	22%	838	25%	779	27%	< 0.01
AIDS-defining illness
18-< 50	3,390	10%	417	11%	385	11%	362	9%	370	9%	344	10%	331	10%	277	10%	270	9%	251	9%	208	8%	175	8%	< 0.01
≥50	1,242	13%	142	18%	127	16%	119	13%	121	12%	133	15%	119	13%	105	13%	105	12%	102	13%	95	11%	74	9%	< 0.01
CD4+ T-cell Count (cells/mm ³ )
18-< 50
Median	298		269		277		275		284		293		313		296		312		323		333		336		< 0.01
IQR	112-493		100-467		96-481		99-464		104-494		100-494		124-501		114-504		127-499		134-500		141-512		152-522
≥50
Median	251		203		211		246		261		234		272		274		261		272		273		266		< 0.01
IQR	90-457		80-390		65-403		88-440		102-464		88-443		111-457		92-475		83-487		81-511		107-491		111-494

^‡P-values calculated using Cochran-Armitage test for categorical variables or Cuzick's test for continuous variables.

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