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. Author manuscript; available in PMC: 2010 Aug 12.
Published in final edited form as: Spine (Phila Pa 1976). 2009 Jul 15;34(16):1722–1731. doi: 10.1097/BRS.0b013e3181a8faf2

Table 2.

Summary of Pearson Correlations Across Times of Assessment for the CTT- and IRT-based Physical Function Scores

Time of Assessment
Time Baseline 6-weeks 3 Months 6 Months 1 Year
Baseline .46 .37 .36 .34
6-weeks .45 .75 .66 .59
3 Months 38 .77 .79 .70
6 Months 36 68 .78 .77
1 Year .35 .61 70 .77

Correlations in the unshaded cells for the CTT-based PF scores, shaded cells are correlations for the IRT-based PF scores