Table 3. Numbers of knee replacements at risk at specified time points in the dataset from which the model was built.

	Years since primary operation
	0	3	5	7	8	9	10	11
Underweight	1,338	807	505	236	153	66	20	0
Normal	49,860	28,400	17,064	8,395	8,395	2,085	199	36
Overweight	168,947	95,567	57,276	27,243	27,243	6,029	2,275	115
Obese class I	159,056	88,937	52,401	24,622	24,622	5,019	1,878	106
Obese class II	80,166	43,631	25,254	11,343	11,343	2,157	758	52
Obese class III	343,433	18,672	10,728	4,752	4,752	917	336	21