Table 3undefined.

Accuracy of IBD case identification information streams

Data source	True positives n / %	False positives n / %	% of total true positives identified
Pathology coding	7661 (99)	81 (1)	73
ICD-10 code K50/51	5525 (75)	1186 (25)	53
Mesalazine prescribing	5079 (84)	956 (16)	48
ICD-10 code K50/51/52	4254 (27)	11 625 (73)	40
Secondary care prescribing	842 (100)	0	8
Paediatric registry	122 (100)	0	1
Total unique cases	10 499	14 102

All true positive, live Lothian or non-Lothian resident IBD cases identified from manual case review of ‘possible’ cases were used to derive the accuracy of each information stream. The proportion of cases accepted as true positive (ie, IBD) or false positive (ie, non-IBD) for each information stream is presented, in addition to the proportion of all true positives.