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Table 1 Cumulative Incidence of Accelerated and Typical Knee Osteoarthritis (KOA) over 5-year intervals

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

 Accelerated
KOA
Typical
KOA
No
KOA
Person-based
 Phase 1: Year 1 - Year 5 (n = 715)25 (3.5%)93 (13.0%)597 (83.5%)
 Phase 2: Year 5 - Year 10 (n = 574)18 (3.1%)169 (29.4%)387 (67.4%)
 Phase 3: Year 10 - Year 15 (n = 377)20 (5.3%)83 (22.0%)274 (72.7%)
Pooled Estimate (95% CI)3.9% (3.0 to 4.9)21.7% (19.7 to 23.8) 
Knee-based
 Phase 1: Year 1 - Year 5 (n = 1508)38 (2.5%)159 (10.5%)1311 (86.9%)
 Phase 2: Year 5 - Year 10 (n = 1255)40 (3.2%)301 (24.0%)914 (72.8%)
 Phase 3: Year 10 - Year 15 (n = 867)48 (5.5%)146 (16.8%)673 (77.6%)
Pooled Estimate (95% CI)3.7% (3.1 to 4.3)17.6% (16.3 to 18.9)