Table 6. Characteristics associated with willingness to continue to answer EQ-5D at each clinic visit.

Characteristics	Willing N = 252; 78%	Unsure / Unwilling N = 70; 22%	Adjusted OR (95% CI)	p-value
Age < 45 years 45–64 years ≥ 65 years	29; 76% 152; 80% 71; 76%	9; 24% 39; 20% 22; 24%	reference 1.59 (0.66–3.84) 1.66 (0.61–4.52)	0.555
Charlson Comorbidity Index 0 1–2 ≥ 3	179; 81% 64; 75% 9; 53%	41; 19% 21; 25% 8; 47%	reference 0.77 (0.40–1.49) 0.25 (0.08–0.73)	0.039
Education Grade 8 education or less Some of completed High school Some of completed college or university Some of completed postgraduate / professional	3; 27% 45;80% 142; 78% 62; 85%	8; 73% 11; 20% 40; 22% 11; 15%	reference 11.98 (2.60–55.29) 10.95 (2.61–45.90) 16.55 (3.59–76.37)	0.004
Primary Language English Other	163; 80% 87; 76%	42; 20% 28; 24%	reference 0.77 (0.43–1.38)	0.388
Breast CancerState State 1 State 2 State 3 State 4 State 5	61; 79% 3; 60% 85; 82% 45; 82% 58; 72%	16; 21% 2; 40% 19; 18% 10; 18% 23; 28%	1.76 (0.79–3.90) 0.55 (0.08–3.61) 1.73 (0.84–3.57) 1.50 (0.62–3.64) reference	0.429

We hypothesised that younger patients (younger than 45 years old), with a lower Charlson Comorbidity Index (0 versus higher), higher education level (versus ≤ 8 grade), English native speakers and who did not present metastatic disease (States 1–4 versus 5) would be more willing to continue to answer the EQ-5D-5L routinely. OR, odds ratio.