Table 2.

Summary of comparison of within group and between group changes in Aδ fiber mediated pain sensitivity.

	Pre	Post	Mean Difference	95% CI	Effect Size (Cohen's d)
WITHIN GROUP COMPARISONS
Low Back
AP	35.7(20.4)	30.1(17.0)	5.6(11.0)	0.1 – 11.1*	0.30
No AP	36.5(20.4)	29.9(22.3)	6.6(12.3)	1.1 – 12.1*	0.31
Lower Extremity
AP	31.1(19.4)	28.3(17.0)	2.8(11.7)	-1.4 – 7.1	0.15
No AP	31.7(22.1)	32.2(26.1)	-0.5(12.0)	-5.8 – 4.8	-0.02
BETWEEN GROUP COMPARISONS (Change Scores)
Low Back
AP × No AP			-1.0(11.3)	-6.5 – 8.6	-0.09
Lower Extremity
AP × No AP			3.3(10.3)	-10.1 – 3.5	0.32

Key: AP= audible pop, No AP= no audible pop; Pain sensitivity assessed with 101 point numeric rating scale anchored with 0= no pain and 100= worst pain sensation imaginable. All findings are presented in mean (standard deviation).

^*= significant at p< 0.05.