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Table 2 Frequency of Unilateral versus Bilateral Outcomes Among People with or without Accelerated, Typical or No Knee Osteoarthritis (KOA)

From: The incidence and characteristics of accelerated knee osteoarthritis among women: the Chingford cohort

Person-based OutcomeLaterality of Outcomen (%)
Phase 1: Year 1- Year 5 (n = 715)
 Accelerated KOA (n = 25)Unilateral (contralateral = Typical KOA)9 (36%)
Unilateral (contralateral = No KOA)9 (36%)
Bilateral7 (28%)
 Typical KOA (n = 93)Unilateral64 (69%)
Bilateral29 (31%)
 No KOA (n = 597)Unilateral0 (0%)
Bilateral597 (100%)
Phase 2: Year 5- Year 10 (n = 574)
 Accelerated KOA (n = 18)Unilateral (contralateral = Typical KOA)5 (28%)
Unilateral (contralateral = No KOA)4 (22%)
Bilateral9 (50%)
 Typical KOA (n = 169)Unilateral83 (49%)
Bilateral86 (51%)
 No KOA (n = 387)Unilateral0 (0%)
Bilateral387 (100%)
Phase 3: Year 10 - Year 15 (n = 377)
 Accelerated KOA (n = 20)Unilateral (contralateral = Typical KOA)3 (15%)
Unilateral (contralateral = No KOA)11 (55%)
Bilateral6 (30%)
 Typical KOA (n = 83)Unilateral51 (61%)
Bilateral32 (39%)
 No KOA (n = 274)Unilateral0 (0%)
Bilateral274 (100%)
  1. Reported percentage is based on the number within each row divided by the number of people with that outcome (i.e., AKOA, Typical KOA, or No KOA)