Table 2.

Relation of independent variables on preoperative pain and change in pain preoperatively to the one year follow-up

	Preoperative Pain			Change in Pain
	Δ*	95% CI	p-value	Δ**	95% CI	p-value
Gender	-6.3	-12.6 - 0.1	0.06	-1.2	-9.6 - 7.1	0.8
Age	-0.7	-0.5 - 0.4	0.8	0.2	-0.4 - 0.8	0.5
BMI kg/m2	-1.1	-1.9 - -0.2	0.01	-0.8	-1.9 - 0.2	0.1
OA grade#
grade 2	0.6	-7.9 - 9.2	0.9	-10.4	-21.5 - 0.7	0.07
grade ≥3	1.9	-6.6 - 10.4	0.7	-6.4	-17.2 - 4.3	0.2
Preoperative HKA-angle	0.3	-0.4 - 1	0.4
Change in HKA-angle ##				0.4	-0.6 - 1.4	0.4
Complications				-1.4	-10.4 - 7.6	0.8
Preoperative Pain				-0.5	-0.7 - -0.3	<0.0001

* Estimated change of preoperative pain per unit change independent variable

** Estimated change of change in pain (preoperatively to the one year follow-up) per unit

change of independent variable

# OA grade according to the Ahlbäck (Ahl) classification, reference Ahl grade 1

## preoperative minus postoperative HKA-angle