The 737 QRP states that LDRs are upped by 15% for all surfaces except 'DRY'. Boeing do not otherwise segregate by wet, flooded or icy, but more sensibly, in my opinion, by reported BA - and it works!
This is the descriptive text: My highlight
Reference distance is for sea level, standard day, no wind or slope, VREF40 approach speed and two engine detent reverse thrust.
Max manual braking data valid for auto speedbrakes. Autobrake data valid for both auto and manual speedbrakes.
For max manual braking and manual speedbrakes, increase reference landing distance by 55 m.
Distances for GOOD, MEDIUM, and POOR are increased by 15%.
Includes distance from 50 ft above threshold (305 m of air distance).