Table 1.

Characteristics of the 13 clinical trials (17 patient groups) included in this meta-analysis

		N of subjects		Age of subjects (years)		Duration (weeks)	Jadad score	Mean baseline blood pressure systolic/diastolic (mm Hg)
		White	Black	White	Black			White	Black
1	Study Group 1982 [26]	170	151	55		7	3	148.2/97.4	147.6/97.8
2	Weinberger 1985 [27]	32	37	*	*	6	0	149.5/99.6	152.7/99.2
3	Thind 1988 [28]	15	10	47.5		4	0	*/97	*/101
4a	Materson 1993, young [29]	39	44	51	49	4	5	149/99	147/100
4b	Materson 1993, old [29]	55	48	66		4	5	154/98	157/100
5a	Weir 1995, 1 mg [24]	51	23	58.3	52.7	6	5	154.8/100.3	149.6/100.2
5b	Weir 1995, 2 mg [24]	53	22	57.3	53.0	6	5	151.9/101.7	144.8/100.2
5c	Weir 1995, 4 mg [24]	53	23	53.0	53.2	6	5	147.6/99.9	155.9/102.9
6	Chrysant 1996 [30]	30	10	53.7		6	4	*	*
7	Weir 1998a [32]	32	13	51		12	5	145.6/89	145.8/91.2
8a	Weir 1998b, 20 mg [31]	48	22	55.5	51.2	4	3	159.9/103	156/105.8
8b	Weir 1998b, 40 mg [31]	43	19	55.6	51.2	4	3	158.4/102.7	157.1/104.8
9	Pahor 2002 [25]	15	18	59.5		4	5	140/86	144/86
10	Cohn 2004 [23], Julius 2004 [22]	7745	1412	56.8	52.3	12	1	157/94.1	156.3/96.5
11	Mokwe 2004 [33]	2046	533	48.9	51.9	18	0	152.2/94.9	150.9/95.6
12	Moran 2007 [35]	89	72	53.8	54.0	8	1	147/87	151/88
13	Van Rijn-Bikker 2009 [34]	33	48	48		6	3	153/95	156/99

*Results not reported.