Table 2.

Transition probability of pain phenotype from baseline to 24-month follow-up

Baseline phenotype	24-month follow-up phenotype
	No Pain	Mild P-A	Mild P-R-A	Mod P-R-A
No Pain	0.829	0.132	0.030	0.009
Mild P-A	0.320	0.531	0.128	0.021
Mild P-R-A	0.174	0.287	0.449	0.090
Mod P-R-A	0.119	0.103	0.323	0.455

Mild P-A mild pain during activity, Mild P-R-A mild pain during both rest and activity, Mod P-R-A moderate pain during both rest and activity