| Value | Category |
|---|---|
| 0 | Not a single reading taken |
| 1 | All three readings taken |
| 2 | First and second readings taken |
| 3 | First and third readings taken |
| 4 | Only first reading taken |
| 5 | Second and third readings taken |
| 6 | Only second reading taken |
| 7 | Only third reading taken |