TABLE 1.

Definitions of Symptomatic OA^*

Joint Site	Symptoms†	AND	Radiographic OA criteria
Hand	hand	+	KL ≥ 2 in at least one DIP AND at least 3 total hand joints
Knee	knee	+	Tibiofemoral joint KL ≥ 2 OR patellofemoral osteophyte ≥2‡ OR TJR§
Hip	hip	+	Hip joint KL ≥ 2 OR TJR§
LS	low back	+	Disc narrowing AND an osteophyte ≥1 at the same level (L1/2-L5/S1)‡

^*Symptomatic OA requires both symptoms and radiographic criteria in the same joint site, on the same side

^†Answered yes to: “on MOST days do you have pain, aching, or stiffness of your ____?”

^‡Osteophyte and disc narrowing graded 0–3 according to the Burnett atlas

^§Joint replacement at knee or hip done for OA per participant report

KL=Kellgren Lawrence grade, DIP=Distal Interphalangeal joint, LS=Lumbosacral Spine, TJR=Total Joint Replacement