Table 5 Factors associated with Self-Administered Patient Satisfaction Scale (SAPS) at 6 months (n = 1060).

	Univariable			Multivariable
	ß (95% CI)	R²	p	ß (95% CI)	p
Age, years	0.20 (0.08, 0.32)	0.012	0.001	0.05 (− 0.04, 0.13)	0.300
Sex (Female vs Male)	− 1.46 (− 3.27, 0.34)	0.003	0.112	–	–
Ethnicity (Non-Chinese vs Chinese)	− 2.39 (− 4.64, − 0.13)	0.004	0.038	− 0.14 (− 1.76, 1.49)	0.870
Type of arthroplasty (UKA vs TKA)	− 1.85 (− 4.92, 1.23)	0.002	0.240	–	–
Education level (Secondary or above vs Primary or below)	− 0.74 (− 2.42, 0.94)	< 0.001	0.390	–	–
BMI, kg/m²	− 0.12 (− 0.30, 0.06)	0.001	0.178	–	–
FCI (0–18)	− 1.56 (− 2.32, − 0.81)	0.013	< 0.001	− 0.23 (− 0.77, 0.30)	0.394
Radiographic severity of index knee (KL grade 4 vs KL grade 0–3)	2.76 (1.09, 4.43)	0.013	0.001	0.29 (− 0.87, 1.45)	0.620
HADS-A (0–21)	− 0.49 (− 0.68, − 0.29)	0.024	< 0.001	0.05 (− 0.15, 0.25)	0.624
HADS-D (0–21)	− 0.84 (− 1.10, − 0.58)	0.039	< 0.001	− 0.09 (− 0.36, 0.18)	0.497
LSNS (0–60)	0.13 (0.05, 0.21)	0.009	0.002	0.08 (0.02, 0.14)	0.008
Baseline WOMAC total (0–96)	− 0.37 (− 0.50, − 0.25)	0.032	< 0.001	0.00 (− 0.10, 0.09)	0.938
HSS-KRES (0–100)	− 0.01 (− 0.08, 0.06)	< 0.001	0.786	–	–
Post KA fulfilment of expectations at 6 months (0–100)	0.38 (0.36, 0.40)	0.537	< 0.001	0.38 (0.35, 0.40)	< 0.001

Bold: variables associated with SAPS at 6 months in multivariable analysis.
Abbreviations: BMI, body mass index; FCI, Functional Comorbidity Index; HADS-A, Hospital Anxiety and Depression Scale-Anxiety; HADS-D, Hospital Anxiety and Depression Scale-Depression; HSS-KRES, Hospital for Special Surgery Knee Replacement Expectations Survey; KL, Kellgren and Lawrence; LSNS, Lubben Social Network Scale; TKA, total knee arthroplasty; UKA, uni-compartmental knee arthroplasty; vs, versus; WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index.

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