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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 4.

Summary of the Number and Percentage of Patients Who Were Classified As Improved, The Same, Or Worse at 1 Year Compared To Baseline for the Three Standard Error Of Measurement Approaches Broken Down By Baseline PF Scores

Baseline PF Score se-GL se-SL se-IRT
Improved Same Worse Improved Same Worse Improved Same Worse
N Pct N Pct N Pct N Pct N Pct N Pct N Pct N Pct N Pct
0 52 80.0 13 20.0 57 87.7 8 12.3 53 81.5 12 18.5
5 52 80.0 13 20.0 . . 57 87.7 6 9.2 2 3.1 57 86.4 9 13.6 . .
10 65 77.4 19 22.6 . . 70 83.3 7 8.3 7 8.3 60 76.9 14 18.0 4 5.1
15 68 87.2 9 11.5 1 1.3 70 89.7 7 9.0 1 1.3 63 81.8 13 16.9 1 1.3
20 55 75.3 15 20.6 3 4.1 62 84.9 7 9.6 4 5.5 57 77.0 13 17.6 4 5.4
25 64 82.1 14 18.0 . . 67 85.9 10 12.8 1 1.3 63 80.8 15 19.2 . .
30 54 78.3 13 18.8 2 2.9 56 81.2 10 14.5 3 4.4 48 76.2 13 20.6 2 3.2
35 50 71.4 17 24.3 3 4.3 57 81.4 10 14.3 3 4.3 58 78.4 13 17.6 3 4.1
40 34 57.6 20 33.9 5 8.5 37 62.7 16 27.1 6 10.2 45 65.2 21 30.4 3 4.4
45 29 58.0 21 42.0 . . 33 66.0 16 32.0 1 2.0 31 57.4 20 37.0 3 5.6
50 22 56.4 14 35.9 3 7.7 24 61.5 10 25.6 5 12.8 27 60.0 12 26.7 6 13.3
55 29 48.3 27 45.0 4 6.7 35 58.3 18 30.0 7 11.7 22 53.7 16 39.0 3 7.3
60 28 63.6 16 36.4 . . 31 70.5 11 25.0 2 4.6 31 59.6 18 34.6 3 5.8
65 20 47.6 15 35.7 7 16.7 23 54.8 10 23.8 9 21.4 22 55.0 12 30.0 6 15.0
70 13 43.3 16 53.3 1 3.3 19 63.3 8 26.7 3 10.0 13 54.2 7 29.2 4 16.7
75 5 20.0 17 68.0 3 12.0 14 56.0 7 28.0 4 16.0 12 36.4 18 54.6 3 9.1
80 2 13.3 10 66.7 3 20.0 9 60.0 3 20.0 3 20.0 2 11.8 12 70.6 3 17.7
85 7 36.8 9 47.4 3 15.8 8 42.1 6 31.6 5 26.3 8 50.0 6 37.5 2 12.5
90 . . 15 100.0 . . 8 53.3 6 40.0 1 6.7 5 35.7 9 64.3 . .
95 . . 8 80.0 2 20.0 4 40.0 3 30.0 3 30.0 1 10.0 7 70.0 2 20.0
100 . . 5 83.3 1 16.7 . . 5 83.3 1 16.7 . . 5 83.3 1 16.7
All 649 65.2 306 30.7 41 4.1 741 74.4 184 18.5 71 7.1 678 68.1 265 26.6 53 5.3

Shaded cells denote the standard error of measurement approach that resulted in the highest identification of Improved or Worsened PF HRQOL Status from baseline.

Within the table the dark lines indicate the zones where different probability cut points were used to define MCID-based classifications of Improved, Same or Worsened, as specified in Figure 1.