. Author manuscript; available in PMC: 2010 Sep 1.

Published in final edited form as: Spinal Cord. 2009 Sep 29;48(3):230–238. doi: 10.1038/sc.2009.112

Table 4.

Pearson correlation coefficients between the two validity criteria (SF-36 MH scale and SPI-I) and the ISCIBPDS scales and ratings.

	Validity criteria
ISCIBPDS items and scales	Psychological functioning (SF-36 MH)	Sleep problems (SPI-I)
Interference items
Limit activities	−.39^**	.45^**
Changed ability	−.40^**	.40^**
Changed satisfaction	−.45^**	.48^**
Day-to-day activity interference	−.46^**	.51^**
Mood interference	−.61^**	.59^**
Sleep interference	−.57^**	.74^**
Interference scales^*
Total Interference	−.55^**	.60^**
LSF Interference	−.45^**	.48^**
AMS Interference	−.60^**	.68^**
Worst pain
Intensity	−.23^*	.38^**
Days of pain	−.19^*	.23^*
Duration of pain	−.09	.06
2^nd worst pain
Intensity	−.25^*	.35^**
Days of pain	−.18	.15
Duration of pain	−.09	.07
3^rd worst pain
Intensity	−.25	.33^*
Days of pain	.14	−.16
Duration of pain	.15	−.06

p <.01

^**

p <.001.

Note: SF-36 MH= SF-36 Mental Health scale; SPI-I = MOS Sleep Problem Index-I; ISCIBPDS = International Spinal Cord Injury Basic Pain Data Set; Three pain interference scales can be computed from the six interference items: Total Interference (average of all six items), LSF Interference (average of the Limit activities, Social/recreational changes, and Family-related changes interference items), and AMS Interference (average of the Activity, Mood, and Sleep interference items).