Table 1

Results from multivariable logistic regression models showing the association between surgeon-level factors and use of new stems and cups

ExposureStemsCups
Established
(n=18 404)*
New
(n=2006)*
OR†(95% CI)P value†Established
(n=17 167)*
New
(n=3243)*
OR†(95% CI)P value†
Proportion of THRs performed on patients <55 years old
 <10% (ref)13 088
(71.1%)
940
(46.9%)
112 346
(71.9%)
1682
(51.9%)
1
 ≥10%5316
(28.9%)
1066
(53.1%)
1.471.30 to 1.66<0.0014821
(28.1%)
1561
(48.1%)
1.391.25 to 1.53<0.001
 Number of THRs performed in calendar year‡
 (per 10 additional cases)
8
(2, 24)
32
(12, 61)
1.020.99 to 1.040.2067
(2, 22)
28
(10, 56)
1.061.04 to 1.08<0.001
Proportion of THRs funded privately
 100% NHS funded (ref)12 922
(70.2%)
966
(48.2%)
112 159
(70.8%)
1729
(53.3%)
1
 Some or all funded privately5482
(29.8%)
1040
(51.8%)
1.231.05 to 1.430.0105008
(29.2%)
1514
(46.7%)
1.090.96 to 1.230.187
Number of stem–cup combinations used in calendar year
 ≤3 (ref)14 259
(77.5%)
589
(29.4%)
113 599
(79.2%)
1249
(38.5%)
1
 4–63394
(18.4%)
822
(41.0%)
4.914.25 to 5.67<0.0012937
(17.1%)
1279
(39.4%)
3.773.36 to 4.23<0.001
 7–10675
(3.7%)
468
(23.3%)
12.510.1 to 15.4<0.001568
(3.3%)
575
(17.7%)
7.216.01 to 8.67<0.001
 >1076
(0.4%)
127
(6.3%)
27.417.9 to 41.7<0.00163
(0.4%)
140
(4.3%)
13.39.20 to 19.2<0.001
Proportion of THRs performed on patients with ASA grade III–V
 <25% (ref)13 244
(72.0%)
1554
(77.5%)
112 362
(72.0%)
2436
(75.1%)
1
 ≥25%5160
(28.0%)
452
(22.5%)
1.010.89 to 1.160.8434805
(28.0%)
807
(24.9%)
1.121.01 to 1.250.034
  • *Proportions displayed are based on surgeon-calendar years.

  • †ORs, 95% CI and p values are from logistic regression models adjusted for all exposure variables.

  • ‡Median (lower to upper quartile).

  • ASA, American Society of Anaesthesiologists; NHS, National Health Service; THR, total hip replacement.