From the notes below the landing distance table:
"Reference distance is for sea level, standard day, no wind or slope...."
This is why there are adjustments (ADJ) that can be made for altitude, wind and slope.
There is also a temperature ADJ column.
The altitude adjustment is made for each 1000ft above sea level. In the table to which I am referring, the values range from 50 to 100, depending on braking action and auto brake setting, so let's assume 80.
So for an airport like Madrid, elevation 2000ft, we would add 2x80=160m to the 'Reference Distance'.
Technically speaking, the 'altitude adjustment' refers to Pressure Altitude, so you should apply a correction for high/low QNH but any resulting difference would be small when compared to the total landing distance.
In your example the QNH is 1013 so no correction for pressure altitude is necessary.
Also, the elevation is 69ft, so using sea level data would be fine.