Table 1.

Visible and non-visible haematuria in cases and controls, according to type of record

Type of haematuriaCases, n = 4915 (%)Controls, n = 21 718 (%)
CodedUncodedCoded or uncodedCodedUncodedCoded or uncoded
Visible2595 (52.8)1991 (40.5)3147 (64.0)196 (0.9)206 (0.9)336 (1.5)
Non-visible127 (2.6)216 (4.4)313 (6.4)26 (0.1)41 (0.2)60 (0.3)
  • Records of haematuria that were in both coded and uncoded format were assumed to refer to a single occurrence of the symptom and counted only once; as such, the total in coded or uncoded format is not the sum of the coded plus uncoded records.