Table 1.
Key model inputs.
| Population Characteristics | Mean (SDa) | Derived from sources |
|---|---|---|
| Age (years) | 57.5 (10.3) | 18 |
| Female | 73% | 18 |
| Race/Ethnicity | ||
| White non-Hispanic | 99.7% | 18 |
| White Hispanic | 0.3% | 18 |
| BMI (kg/m2) | ||
| Restricted Cohort | 28 (6) | 29 |
| Unrestricted Cohort | 28 (7) | 29 |
| Kellgren Lawrence (KL) grade | ||
| 2 | 100% | Assumption |
| Starting WOMAC knee painb | 38.2 (21.8) | 18 |
| Restricted Cohort | ||
| Inactive | 32% | 18 |
| Insufficiently active | 68% | 18 |
| Active | 0% | 18 |
| Unrestricted Cohort | 18 | |
| Inactive | 16% | 18 |
| Insufficiently Active | 34% | 18 |
| Active | 50% | 18 |
| Annual improvement in QoL compared to inactive subjects | ||
| Insufficiently active | 0.019 | 10 |
| Active | 0.037 | 10 |
| Annual decrease in cost compared to inactive subjects | ||
| Insufficiently active | $351 | 5, 6 |
| Active | $799 | 5, 6 |
| WWEc Intervention Parameters |
18 |
||
|---|---|---|---|
|
PA efficacy | |||
| PAGd at baseline | PAG at 6 weeks | Probability | Probability of returning to background PAG each subsequent month |
| 1e | 1 | 0.05 | NA |
| 2 | 0.49 | 0.35 | |
| 3 | 0.46 | 0.37 | |
| 2f | 1 or 2 | 0.34 | NA |
| 3 | 0.66 | 0.41 | |
| 3g | 1 or 2 | 0.13 | NA |
| 3 | 0.87 | 0.33 | |
| Costsh | |||
| Start-up | $28 | ||
| Per-month | $16 | ||
a
Standard deviation.
b
Starting pain according to the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) pain scale (0 = best, 100 = worst).
c
Walk With Ease.
d
Physical activity group.
e
PAG 1: Inactive (0–30 min of PA/week).
f
PAG 2: Insufficiently active (31–179 min of PA/week).
g
PAG 3: Active (≥180 min of PA/week).
h
Costs are in 2020 USD and account for all costs of the Montana implementation of WWE.