Table 2.

Intragroup Comparisons of Change in Mean VAS Pain Score in the Test (PRP) and Control (DN) Groups for Different Time Intervals

	Baseline–2 wk	2 wk–4 wk	4 wk–3 mo	3 mo–6 mo
Z (Test)	–3.417 a	–3.357 a	–0.638 b	–1.633 a
P value	.001	.001	.523	.102
Z (Control)	–3.238 a	–2.276 a	–0.085 b	–0.085 a
P value	.001	.023	.932	.932

Significant values are in bold.

^a Based on positive ranks.

^b Based on negative ranks.