BMC Medical Research Methodology

Table 2 ES(z) of the studies included in the meta-analysis

From: The impact of disease-related impairments on disability and health-related quality of life: a systematic review

	ES(z) impairment – disability (n = 31)	ES(z) impairment – HRQL (n = 31)
References		generic (n = 23)	disease-specific (n = 10)	physical (n = 13)	mental (n = 21)
Deyo, 1983 [22]	0.23	0.31			0.32
Birrell, 1998 [19]	0.81	0.49		0.65	0.37
Kvien, 1998 [29]	0.50	0.39	0.42		0.41
Wolfe, 2000 [45]	0.35	0.38		0.47	0.29
Angst, 2004 [16]	0.60	0.07		0.29	-0.15
Angst, 2005 [17]	0.60	0.11		0.41	-0.17
Salaffi, 2005 [39]	1.00	0.46		0.41	0.51
Rothwell, 1997 [37]	1.30	0.15			0.05
Sharrack, 1999 [42]	1.05	0.48			0.21
Schwartz, 1999 [41]	0.50	0.68
Miller, 2000 [34]	1.02	0.18		0.18	0.18
Hobart, 2000 [26]	1.33	0.06		0.34	0.14
Rasova, 2005 [36]	0.56		0.22	0.39	0.04
Rubenstein, 1998 [38]	0.73	0.40		0.48	0.31
Schrag, 2000 [40]	0.66	0.32	0.55	0.49	0.21
Franchignoni, 2005 [23]	0.79		0.71
de Haan, 1993 [21]	0.87	0.52			0.37
Gottlieb, 2001 [25]	0.55	0.16
Fuhrer, 1992 [24]	0.85	0.04
May, 2002 [33]	1.26		0.06
Marx, 2001 [32]	1.19	0.35		0.83	0.01
Paxton, 2003 [35]	0.35		0.49
MacDermid, 2001 [31]	0.85	0.41		0.54	0.29
Beaton, 1996 [18]	0.40	0.28
Lindeboom, 1998 [30]	0.23	0.21
Vinik, 2005 [44]	0.66		0.59
Kahn, 2001 [28]	0.87		0.78		0.78
Cleary, 1993 [20]	0.60	0.38			0.38
Speyer, 2004 [43]	1.05		0.55		0.44
Hu, 2005 [27]	0.46	0.45		0.29	0.60
Zachariae, 2002 [46]	0.44		0.40

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