Incidence, outcomes and risk factors of postoperative urinary retention in patients undergoing primary total knee arthroplasty: a national inpatient sample database study

Table 2 Annual and cumulative incidence of postoperative urinary retention after primary total knee arthroplasty

Year	POUR^a	No POUR	Incidence (%, 95% CI^b)
2005	1,542	100,343	1.51 (1.44–1.59)
2006	1,519	100,899	1.48 (1.41–1.56)
2007	1,894	111,899	1.66 (1.59–1.74)
2008	2,092	123,941	1.66 (1.59–1.73)
2009	2,022	120,847	1.65 (1.58–1.72)
2010	2,755	130,240	2.07 (1.99–2.15)
2011	2,934	130,815	2.19 (2.11–2.27)
2012	2,709	123,525	2.15 (2.07–2.23)
2013	2,923	129,575	2.21 (2.13–2.29)
2014	3,113	133,034	2.29 (2.21–2.37)
			Cumulative incidence
Total	23,503	1,205,118	1.91 (1.89–1.93)

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