Table 2. Linear regression adjusted differences between non-arthritic participants and participants with any combination of hip and/or knee arthroplasties in primary activity measures.
| Metric | Reference Cohort | End-Stage Knee and/or Hip Osteoarthritis (n=514) | 12+ Months After First Knee or Hip Arthroplasty (n=2,992) |
|---|---|---|---|
| Median Daily Step Count (steps/day) | Non-Arthritic (n=68,389) | -1,129 [-1,447, -811] (p<0.001) | -482 [-619, -345] (p<0.001) |
| End-Stage Knee and/or Hip Osteoarthritis (n=514) | 648 [305, 990] (p<0.001) | ||
| Peak Cadence (steps/min) | Non-Arthritic (n=68,389) | -4.8 [-5.8, -3.9] (p<0.001) | -3.3 [-3.7, -2.9] (p<0.001) |
| End-Stage Knee and/or Hip Osteoarthritis (n=514) | 1.6 [0.5, 2.6] (p=0.004) | ||
| Overall Acceleration (mg) | Non-Arthritic (n=68,389) | -0.1 [-0.8, 0.6] (p=0.753) | 0.2 [-0.1, 0.5] (p=0.238) |
| End-Stage Knee and/or Hip Osteoarthritis (n=514) | 0.3 [-0.4, 1.0] (p=0.461) | ||
| Moderate-to-Vigorous Activity (min/day) | Non-Arthritic (n=68,389) | -5.8 [-8.7, -3.0] (p<0.001) | -2.8 [-4.1, -1.6] (p<0.001) |
| End-Stage Knee and/or Hip Osteoarthritis (n=514) | 3.0 [-0.1, 6.0] (p=0.055) |
Estimate [95% confidence interval] in activity metrics adjusted for age, sex, body mass index, season, Charlson comorbidity index, education, ethnicity, alcohol consumption, and smoking status. A negative difference indicates lower activity in the cohort of interest relative to the reference cohort.