Table 1. Proportion of patients with and without cognitive impairment at year 3 (end of the core study) who did/did not complete follow-up at year 5.

Cognitive status at year 3 (n = 265)	Completed 5-year follow-up,%
	No (n = 64)	Yes (n = 201)	Total	Pearson chi-squared test
Not impaired (n = 216)	79.49	81.92	80.78	0.574
Impaired (n = 49)	20.51	18.08	19.22
Total	100.0	100.0	100.0