Table 3.

Relation between hand map (area, centroid location, gradient variability) and clinical measures (CRPS duration, quickDASH score of upper limb disability, average pain intensity rated during the MRI scans, in the 2 and 7 d preceding the MRI session, and severity score derived from pain pressure thresholds)^a

Variable 1	Variable 2	r (affected side)	r (unaffected side)	z test	p (two-tailed)	Critical B-H (5% FDR)
Map area	CRPS duration	−0.56	−0.13	−1.26	0.208	0.017
Map area	Limb disability score	0.06	0.00	0.15	0.881	0.033
Map area	Pain rating (during scan)	0.20	0.23	−0.08	0.936	0.042
Map area	Pain rating (2 d)	0.55	−0.02	1.63	0.103	0.008
Map area	Pain rating (7 d)	−0.21	0.02	−0.60	0.549	0.025
Map area	PP severity	−0.31	−0.34	0.07	0.944	0.050
Map location	CRPS duration	−0.19	0.52	−1.98	0.048	0.008
Map location	Limb disability score	−0.03	0.02	−0.15	0.881	0.033
Map location	Pain rating (during scan)	0.30	−0.01	−0.74	0.459	0.017
Map location	Pain rating (2 d)	0.31	0.14	0.47	0.638	0.025
Map location	Pain rating (7 d)	−0.06	−0.04	−0.03	0.976	0.042
Map location	PP severity	0.01	0.01	−0.02	0.984	0.050
Map gradient variance	CRPS duration	0.40	0.20	0.55	0.5823	0.025
Map gradient variance	Limb disability score	0.35	0.22	0.37	0.7114	0.033
Map gradient variance	Pain rating (during scan)	0.28	0.26	0.07	0.9442	0.050
Map gradient variance	Pain rating (2 d)	0.17	0.24	−0.19	0.8493	0.042
Map gradient variance	Pain rating (7 d)	0.31	0.63	−1.03	0.303	0.008
Map gradient variance	PP severity	0.52	0.21	0.90	0.3681	0.017

^aPairwise correlations were performed between the variables listed in the first and second columns, separately for the affected and unaffected hemispheres (patients only). The resulting Pearson's r coefficients are reported in columns 3 and 4, transformed in z scores, and compared using a z test; z scores and uncorrected p values for these comparisons are reported in columns 5 and 6. The FDR-corrected critical p value (using a Benjamini–Hochberg procedure) is reported in column 7.