Table 3

Predicted quality of life and costs by age at operation

Outcome	THR			TKR
Outcome	Age<60	Age 60–79	Age≥80	Age<60	Age 60–79	Age≥80
A. Quality of life
Postoperative EQ-5D utility	0.778	0.794	0.729	0.637	0.731	0.722
Preoperative EQ-5D utility	0.316	0.348	0.281	0.310	0.404	0.397
EQ-5D utility>12 months after primary arthroplasty	–	–	–	0.616	0.689	0.645
EQ-5D utility before revision surgery	0.301	0.356	0.386	0.225	0.329	0.312
EQ-5D utility after revision surgery	0.572	0.670	0.562	0.418	0.558	0.521
B. Costs (in £)
Costs of primary arthroplasty	5420	5504	5763	5939	6039	6255
Costs of revision arthroplasty	8108	7938	7991	8020	7685	7390
Costs in the 12 months before arthroplasty	626	394	398	1150	804	634
Readmissions<12 months after primary arthroplasty	370	430	726	504	519	762
Ambulatory costs<12 months after primary arthroplasty	151	96	62	561	353	243
Readmissions>12 months after primary arthroplasty	135	117	110	218	171	156
Readmissions in the year of revision surgery	633	761	1344	763	857	941
Readmissions>12 months after revision surgery	159	151	139	428	242	105
Ambulatory costs>12 months after primary arthroplasty	–	–	–	50	27	27
Ambulatory costs in the year of revision surgery	–	–	–	711	556	160
Ambulatory costs for patients after revision surgery	–	–	–	145	124	118

The columns show average predicted quality of life and costs for patients in different age groups at primary operation. Predictions are averaged across the estimation sample.
EQ-5D, EuroQoL-5 Dimensions; THR, total hip replacement; TKR, total knee replacement.