. Author manuscript; available in PMC: 2015 Mar 1.

Published in final edited form as: Reg Anesth Pain Med. 2014 Mar-Apr;39(2):120–125. doi: 10.1097/AAP.0000000000000058

Table 2.

Mean (± SD) chronic back pain ratings pre- and post-drug by drug condition.

	Drug Condition
	Placebo			Naloxone			Morphine

Chronic Pain Measure	Pre-Drug	Post-Drug	Change	Pre-Drug	Post-Drug	Change	Pre-Drug	Post-Drug	Change
MPQ-Sensory	5.8±6.07	4.8±6.29	-0.98±2.83^a	6.5±7.12	5.3±6.19	-1.21±2.69^b	6.9±6.88	3.9±5.99	-2.97±4.66^a,b
MPQ-Affective	1.08±2.04	0.7±1.73	-0.26±1.34	1.2±2.07	0.8±1.80	-0.38±1.76	1.0±2.05	0.6±1.47	-0.37±1.36
VAS Intensity	33.2±26.82	30.4±27.53	-2.76±9.76^a	34.3±28.86	29.4±28.14	-4.87±10.64^b	38.6±28.94	24.2±28.85	-14.4±16.07^a,b

Note: Negative values for change measures indicate reduced pain post-drug relative to pre-drug. Change values with the same superscript letter denote significant differences in the change scores across drug conditions at P < .05.