Fig. 1

The OHS and EQ-5D-3L – total population (1, 3) and the transition level (2, 4). Fitted 3rd degree Box-Cox regression lines 1 for the OHS total population and 2 by the patients’ self-assessed transition level. The 2nd degree Box-Cox regression estimates 3 for the EQ-5D-3L total hip surgery population and 4 by the patients’ self-assessed transition level. All the graphs are presented by age group additionally. Colourful dots indicate 50th percentile for each category, and grey dots indicate actual observations. Grey horizontal lines indicate each defined score improvement (e.g. 22 for the OHS and 0.428 for the hip EQ-5D-3L). Percentiles of the EQ-5D-3L show all over disperse patterns by the transition level whereas percentiles of the OHS show disperse patterns in ‘A little worse’ and ‘Much worse’ transition level. Model performance of the OKS and the knee EQ-5D-3L is provided in Supplementary Figure 1