Table 3.

Regression analysis on VAS values and EQ-5D dimensions, individual-level data

	Model 1		Model 2		Model 3		Model 4		Model 5		Model 6
	Estimate	p value	Estimate	p value	Estimate	p value	Estimate	p value	Estimate	p value	Estimate	p value
Intercept	82.39	<0.0001	82.39	<0.0001	82.39	<0.0001	82.39	<0.0001	82.39	<0.0001	82.39	<0.0001
Mobility
Level 2	−6.55	<0.0001	−6.53	<0.0001	−6.39	<0.0001	−6.35	<0.0001	−6.52	<0.0001	−6.49	<0.0001
Level 3	−8.36	<0.0001	−8.10	<0.0001	−8.13	<0.0001	−7.86	<0.0001	−9.48	<0.0001	−9.23	<0.0001
Self-care
Level 2	0.74	0.0212	0.80	0.0126	–	–	–	–	–	–	–	–
Level 3	−2.69	0.0008	−2.66	0.0009	–	–	–	–	–	–	–	–
Level 3a	–	–	–	–	−3.21	<0.0001	−3.22	<0.0001	–	–	–	–
Level 2 and 3	–	–	–	–	–	–	–	–	0.57	0.76	0.63	0.0500
Usual activities
Level 2	−6.18	<0.0001	−6.14	<0.0001	−5.89	<0.0001	−5.83	<0.0001	−6.11	<0.0001	−6.07	<0.0001
Level 3	−11.53	<0.0001	−8.93	<0.0001	−11.21	<0.0001	−8.64	<0.0001	−12.49	<0.0001	−9.91	<0.0001
Pain/discomfort
Level 2	−11.07	<0.0001	−11.04	<0.0001	−11.07	<0.0001	−11.04	<0.0001	−11.06	<0.0001	−11.04	<0.0001
Level 3	−13.98	<0.0001	−12.76	<0.0001	−13.98	<0.0001	−12.78	<0.0001	−14.34	<0.0001	−13.13	<0.0001
Anxiety/depression
Level 2	−8.44	<0.0001	−8.39	<0.0001	−8.41	<0.0001	−8.37	<0.0001	−8.43	<0.0001	−8.39	<0.0001
Level 3	−16.68	<0.0001	−14.93	<0.0001	−16.63	<0.0001	−14.90	<0.0001	−16.79	<0.0001	−15.04	<0.0001
N3	–	–	−3.45	<0.0001	–	–	−3.39	<0.0001	–	–	3.43	0.0001
Observations	120,709		120,709		120,709		120,709		120,709		120,709
Adj R 2	0.2405		0.2406		0.2404		0.2406		0.2404		0.2406

F-tests have been performed between models with and without N3 term, no result is significant at p = 0.05 level

^aReference group: self-care on level 1 or 2