Table 3.

Cox regression analysis with crude and adjusted hazard ratios of double-bundle (DB), single-bundle hamstring tendon (SBHT), and single-bundle bone patellar tendon-bone (SB BPTB) grafts and other covariates

Covariate	Number	Revisions (%)	HR (crude)	CI	p value	HR (adjusted)	CI	p value
Graft
DB	994	37 (3.7)	1			1
SBHT	51,991	1952 (3.8)	1.18	0.85–1.62	0.33	1.24	0.89–1.72	0.20
SB BPTB	7790	219 (2.8)	0.77	0.55–1.10	0.15	0.62	0.43–0.90	0.01
Missing	3
Sex
Male	35,759	1223 (3.4)				1
Female	25,019	985 (3.9)				0.95	0.87–1.04	0.27
Age group (years)
14–19	14,733	985 (6.7)				1
20–24	12,645	568 (4.5)				0.69	0.62–0.77	<0.001
25–29	9280	252 (2.7)				0.39	0.34–0.45	<0.001
30–60	24,120	403 (1.7)				0.23	0.21–0.26	<0.001
Country
Norway	14,648	613 (4.2)				1
Denmark	19,831	727 (3.7)				0.94	0.84–1.06	0.32
Sweden	26,299	868 (3.3)				0.69	0.62–0.77	<0.001
Meniscal injury
No	33,584	1257 (3.7)				1
Yes	27,194	951 (3.5)				0.97	0.89–1.06	0.53
Cartilage injury
No	47,689	1866 (3.9)				1
Yes	13,089	342 (2.6)				0.94	0.83–1.06	0.29
Fixation femur
Metal screw	9788	357 (3.6)				1
Bioscrew	766	33 (4.3)				0.80	0.55–1.17	0.26
Button	24,872	906 (3.6)				0.81	0.68–0.96	0.01
Other	25,089	902 (3.6)				0.59	0.50–0.71	<0.001
Missing	263
Fixation tibia
Metal screw	17,564	609 (3.5)				1
Bioscrew	10,859	399 (3.7)				1.18	1.03–1.36	0.02
Button	1035	13 (1.3)				1.57	0.90–2.74	0.11
Other	30,873	1171 (3.8)				1.13	1.00–1.27	0.04
Missing	447

Bold values indicate statistical significance (p < 0.05)

HR = hazard ratio; CI = confidence interval.