Table 7.

Comparison of the mean of the components of the disease activity indices within each disease activity state between Dutch and Portuguese populations using one randomly selected visit per patient.

	Remission		Low		Moderate		High
	z	p-Value	z	p-Value	z	p-Value	z	p-Value
A. DAS28-ESR
PGA	1.26	0.2079	0.51	0.6096	3.29	0.001	3.29	0.001
TJC28	4.1	<0.0001	3.33	0.0009	−0.39	0.6988	−3.08	0.0021
SJC28	1.68	0.0932	1.58	0.1151	1.65	0.099	0.49	0.6267
ESR	−5.85	<0.0001	−3.54	0.0004	−5.65	<0.0001	−2.26	0.0241
DAS28-ESR	−3.36	0.0008	−0.03	0.9799	−2.73	0.0064	−2.09	0.0364
B. CDAI
PGA	−0.51	0.6132	−3.64	0.0003	2.18	0.0296	1.31	0.19
MDGA	3.75	0.0002	4.76	<0.0001	6.57	<0.0001	3.77	0.0002
TJC28	0.94	0.3449	−0.37	0.7124	−4.46	<0.0001	−3.93	0.0001
SJC28	−2.58	0.0098	−0.69	0.4895	−1.74	0.0811	−1.21	0.2262
CDAI	0.96	0.339	−1.02	0.3081	−0.54	0.5865	−2.56	0.0105
C. SDAI
PGA	−2.37	0.0178	−2.73	0.0062	1.27	0.2042	0.59	0.5526
MDGA	1.79	0.0739	5.62	<0.0001	9.13	<0.0001	3.1	0.0019
TJC28	0.93	0.3516	1.38	0.1677	0.24	0.808	−0.05	0.9585
SJC28	−0.97	0.3312	0.1	0.9224	−0.6	0.5506	0.26	0.7943
CRP	−1.42	0.157	−2.27	0.0234	−4.62	<0.0001	−2.8	0.0051
SDAI	−1.14	0.2532	1.03	0.3012	2.4	0.0166	−0.23	0.8171

Visits, number of visits (%); PGA, patient assessment of disease activity (100 mm); TJC28, 28 tender joint count; SJC28, 28 swollen joint count; MDGA, physician assessment of disease activity (100 mm); CRP, C-reactive protein (mg/l); ESR, erythrocyte sedimentation rate (mm/h); DAS28-ESR, disease activity score evaluating 28 joints; CDAI, clinical disease activity index; SDAI, simplified disease activity index; z, z-test for equality of two independent means (z > 0 if the mean for Dutch group is higher than for Portuguese group).