Table 1:

Relationship between qualitative clinical assessments in the demographics to numerical values used in polynomial model fitting.

Covariate Value	TRS	RVF
0	Trivial	Normal
1	Mild	Low normal
1.5	Mild to moderate	Low normal to mildly diminished
2	Moderate	Mildly diminished
2.5	Moderate to severe	Mildly to moderately diminished
3	Severe	Moderately diminished
3.5		Moderately to severely diminished
4		Severely diminished