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Table 4 Average Scores of the Improvement Factors for Various Cohorts.

From: Functional improvement after Total Knee Arthroplasty Revision: New observations on the dimensional nature of outcome

  "Factor Analysis" cohort "Total" cohorts
Factor N Mean ± SD Normalized Mean# N Mean ± SD Normalized Mean#
V1 69 0.82 ± 0.77* 1.07* 165 0.72 ± 0.79* 0.91*
V2 69 0.93 ± 0.75* 1.24* 120 0.88 ± 0.76* 1.16*
V3 69 0.21 ± 1.00 0.21 172 0.13 ± 1.00 0.13
V4 69 1.60 ± 1.00* 1.60* 105 1.64 ± 1.00* 1.64*
  1. "Factor Analysis" cohort contains cases (69) when all four factors can be computed; Four "Total" cohorts contain cases (105–172) when at least one factor can be computed.
  2. # Normalized by standard deviation
  3. * Significantly different from 0 at the 0.01 level (2-tailed)