Table 2. Classification of discrepancies with reference to device attributable errors.

Type of error	Description of error
Paper	Paper entry incorrect
	Paper entry missing
	Tablet entry missing because paper interviewer (lead) did not follow the skip logic
Tablet	Tablet entry incorrect
	Tablet entry missing
	Paper entry missing because of tablet interviewer (lead) skip logic
Paper and tablet	Both paper and tablet entries incorrect or missing
Device non-specific	Recording inadequate to specify correct entry code (Ambiguous response or unclear audio)