Table 4.

Pain Improvement Mann-Whitney U test.

Mann-Whitney U | test statistics | average pain	Mann-Whitney U	Wilcoxon W	Z	Asymp. Sig. (2-tailed)
Categorical improvement average pain after 1 week	924,000	1914,000	−1358	0,175
Categorical improvement average pain after 4 weeks	775,000	1678,000	−2608	0,009
Categorical improvement average pain after 8 weeks	866,000	1856,000	−1369	0,171
Categorical improvement average pain after 16 weeks	964,000	1954,000	−0,292	0770
Categorical improvement average pain after 26 weeks	956,000	1946,000	−0,363	0716
Categorical improvement average pain after 40 weeks	900,000	1935,000	−0,947	0344
Categorical improvement average pain after 1 year	987,000	1977,000	−0,029	0977
Mann-Whitney U | test statistics | worst pain	Mann-Whitney U	Wilcoxon W	Z	Asymp. Sig. (2-tailed)
Categorical improvement worst pain after 1 week	836,000	1826,000	−2708	0,007
Categorical improvement worst pain after 4 weeks	797,500	1700,500	−2371	0,018
Categorical improvement worst pain after 8 weeks	867,000	1857,000	−1550	0,121
Categorical improvement worst pain after 16 weeks	930,000	1920,000	−0,719	0472
Categorical improvement worst pain after 26 weeks	945,000	1935,000	−0,506	0613
Categorical improvement worst pain after 40 weeks	927,500	1962,500	−0,690	0490
Categorical improvement worst pain after 1 year	935,000	1925,000	−0,598	0550