Table 1.
Visible and non-visible haematuria in cases and controls, according to type of record
| Type of haematuria |
Cases, n = 4915 (%)
|
Controls, n = 21 718 (%)
|
||||
|---|---|---|---|---|---|---|
| Coded | Uncoded | Coded or uncoded | Coded | Uncoded | Coded or uncoded | |
| Visible | 2595 (52.8) | 1991 (40.5) | 3147 (64.0) | 196 (0.9) | 206 (0.9) | 336 (1.5) |
| Non-visible | 127 (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.