Has anyone compared ActiGraph wGT3X-BT vs Axivity AX3 for upper-limb use in home contexts? I’m prioritizing test–retest ICC, 7-day wear-time compliance, and 100 Hz data workflows that map to OT-relevant outcomes (e.g., activity counts aligned with ADL epochs); any notes on calibration, non-wear detection, or published cut-point validity would help. Budget only covers one device this quarter, so real-world pros/cons matter.
“published cut-point validity would help.” In our home trials, AX3 at 100 Hz with GGIR gave steadier test–retest using ENMO and an arm-use ratio and better 7‑day wear when we waterproofed it on the dorsal wrist and asked for a 30‑sec quiet stand at fit for autocal/non‑wear checks; if you truly need counts, wGT3X‑BT is simpler, but wrist cut‑points for upper‑limb ADLs are still wobbly — would raw epochs mapped to ADLs work for you?
Quick tip that tightened our test–retest ICC: add a 2‑min ‘functional calibration’ at fit (30 s quiet rest, 10 reach‑to‑mouth, 10 reach‑to‑shelf) and derive subject‑specific ENMO bands in GGIR (GitHub - wadpac/GGIR: Code corresponding to R package GGIR) for ADL mapping. It worked with both AX3 and wGT3X‑BT, though on wGT3X‑BT we had to use the normal filter and ±8 g at 100 Hz to avoid clipping during transfers; published wrist cut‑points didn’t translate well to forearm. Mounting at dorsal forearm or wrist for your cohort?