Table 1: Summary of dominant reason a household RALF was not assigned for persons in the use case cohort.

Main reason for NULL household RALF	Reason rank	Frequency	%
Multiple different valid household RALFs	1	423	4.2
No valid household RALFs	2	5,548	55.4
No address records at event date	3	963	9.6
Not alive or no regular registrations at event dates	4	3,091	30.8
Total		10,025	100

RALF = Residential Anonymous Linking Field.