Number	Percentage
1340 of FDRs of T2DM patients who were visited once*	49.12%
709 of FDRs of T2DM patients who were visited twice	25.99%
373 of FDRs of T2DM patients who were visited three	13.67%
151 of FDRs of T2DM patients who were visited four	5.54%
73 of FDRs of T2DM patients who were visited five	2.66%
50 of FDRs of T2DM patients who were visited six	1.83%
29 of FDRs of T2DM patients who were visited seven	1.06%
3 of FDRs of T2DM patients who were visited eight	0.11%
2728 of FDRs of T2DM who entered into the open cohort study	100%

*They did not attend any follow-up examination. FDRs = First-degree relatives; T2DM = Type 2 diabetes mellitus