. 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 5.

Regression analyses model predicting pain interfernce (ISCIBPDS Total interference score), psychological functioning (SF-36 Mental Health scale) and sleep problems (SPI-I) from the worst, second worst, and third worst pain intensity ratings (N = 88)

Step and predictor variables	Total R²	R² Δ	F (R² Δ)	Beta to enter
Pain interference (ISCIBPDS Total Interference)
1: Worst pain intensity	.21	.21	23.52^***	.46^***
2: 2nd worst pain intensity	.27	.05	6.12^*	.28^*
3: 3rd worst pain intensity	.29	.02	2.49	.19
Sleep problems (SPI-I)
1: Worst pain intensity	.05	.05	4.56^*	.22^*
2: 2nd worst pain intensity	.09	.04	4.08^*	.26^*
3: 3rd worst pain intensity	.12	.03	3.04^†	.23^†
Psychological functioning (SF-36 Mental Health)
1: Worst pain intensity	.00	.00	0.37	−.07
2: 2nd worst pain intensity	.02	.02	1.70	−.17
3: 3rd worst pain intensity	.07	.05	4.13^*	−.38^*

^†

p < .10

p < .05

^**

p < .01

^***

p < .001

Note: ISCIBPDS Total interference = Composite score of the six interference items from the International Spinal Cord Injury Basic Pain Data Set Items; SF-36 = SF-36 Mental Health scale, higher scores indicates better psychological functioning; SPI-I = MOS Sleep Problem Index-I, a 6-item short-form version of the MOS Sleep Scale.