Results for non-parametric group comparison tests (Mann-Whitney and Chi-Square) between THA and TKA patients on socio-demographic, clinical and psychological measures at T1, T2 and T3.

Note. Continuous variables are presented as median (range); categorical variables are presented as n (%); T1–24 hours before surgery; T2–48 hours after surgery; T3–4–6 months after surgery;

1

BMI = body mass index;

2

Comorbidities total = number of comorbid health conditions;

3

NRS(BPI) = Numerical Rating Scale 0–10 from Brief Pain Inventory;

4

Pain Total Interference Scale 0–70 from Brief Pain Inventory (BPI);

5

Pain Frequency: constant pain vs intermittent or brief pain, assessed via frequency subscale of McGill Pain Questionnaire;

a

HADS = Hospital Anxiety and Depression Scale;

b

IPQ-R = Illness Perception Questionnaire-Revised.