Table 4

Summary of mixed logit interaction effects

Pain outcomesFunction outcomesRisk of complications
No daytime painModerate daytime painNo night-time painModerate night-time painNo difficulty standingModerate difficulty standingNo difficulty movingModerate difficulty movingReoperationNew GP visits
Surgeon personality traits
 BFI - openness[-] ns[-] ns[-] ns[+] ns[+] **[+] **[-] ns[-] *** [+] ns[+] ns
 BFI - conscientiousness[+] ns[+] ns[-] ns[-] ns[-] ns[-] ns[+] ns[+] ns[-] ns[+] ns
 BFI - extraversion[-] ns[-] ns[-] ns[+] ns[-] ns[-] ns[+] ns[-] *[+] ns[+] ns
 BFI - agreeableness[+] ns[+] ns[+] ns[+] ns[-] ns[-] ns[+] ns[+]**[-] ns[-] ns
 BFI - neuroticism[-] ns[+] ns[-] ns[-] ns[+] ns[+] ns[-] ns[-] ns[+] ns[+] ns
 LOC[-] ns[-] ns[-] ns[-] ns[-] ns[-] ns[-] ns[+] ns[-] ns[+] ns
 LOTR[+] ns[+] ns[+] ns[+] ns[+] ns[+] ns[+] ns[+] *[-] *[-] ns
Surgeon experience
 Years of experience[-] ns[-] ns[-] ns[-] ns[-] ns[-] ns[-] ns[-] *[+] ns[+] ns
Surgeon volume
 High volume surgeons[+] ns[+] ns[+] ns[-] ns[+] ns[+] ns[-] ns[-] ns[+] ns[+] ns
Public vs private TKA surgery
 Proportion of public to private[-] ns[+] ns[-] ns[-] ns[+] ns[+] ns[-] ns[-] ns[+] ns[+] ns
  • ***P≤0.01, **P≤0.05, *P≤0.1, sign of coefficient in square brackets.

  • The sample size of each model varies from between 2892 and 3680 observations, from between 245 and 310 respondents.

  • BFI, Big Five Personality Index; GP, general practitioner; LOC, Mastery Locus of Control; LOTR, Life Orientation Test-Revised, ns, not significant; TKA, total knee arthroplasty.