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Table 3 Significant Fixed Effects and Random Effects for Each of the Models

From: Modeling early recovery of physical function following hip and knee arthroplasty

Measure

Average Recovery Model (Fixed Effects)

Individual Variations in Recovery (Random Effects)

Six Minute Walk test (6 MWT)

intercept (one week status), slope (rate of change at 1 week), quadratic term (weeks2)

Predictors: preoperative 6 MWT baseline score, gender; site of arthroplasty

Interactions: site of arthroplasty with rate of change at 1 week, baseline score with rate of change at 1 week

intercept

Timed Up and Go Test (TUG)

intercept, slope, quadratic term

Predictors: preoperative TUG baseline score, gender, site of arthroplasty, additional outpatient treatment

Interactions: site of arthroplasty with rate of change at 1 week

intercept

Timed Stair Test (ST)

intercept, slope, quadratic term

Predictors: preoperative ST baseline score, gender, site of arthroplasty, additional outpatient treatment

Interaction s: site of arthroplasty with rate of change at 1 week

intercept

WOMAC Physical Function (PF) Subscale

intercept, slope, quadratic term

Predictors: preoperative WOMAC PF baseline score

intercept

Lower Extremity Function Scale

intercept, slope, quadratic term

Predictors: preoperative LEFS baseline score, gender

intercept, slope