Table 2.

Linear regression model with difference, 95% confidence interval (CI), and with WOOS at 1 year as the dependent variable

Factor	Univariate model (95% CI)	Multivariable model (95% CI)
Year of operation (change per year)	1.8 (1.2 to 2.2)	1.0 (0.5 to 1.5)
Arthroplasty type a
TSA	Reference	Reference
RHA	–12 (–9.4 to –15)	–6.6 (–3.5 to –9.8)
SHA	–14 (–10 to –17)	–11 (–7.8 to –15)
RSA	–7.2 (–2.5 to –12)	–7.0 (–2.4 to –12)
Sex
Women	Reference	Reference
Men	2.4 (0.1–4.8)	5.6 (3.3 to 8.0)
Age
≥≥ 75	Reference	Reference
56–74	1.1 (–1.7 to 3.9)	0.6 (–3.5 to 2.2)
≤≤ 55	–16 (–12 to –20)	–18 (–13 to –23)

^aFor abbreviations, see Table 1