# Table 5 Correlationsa of VEINES-QOL and VEINES-Sym at baseline with SF12 components, reported pain and other problems, size and duration of the ulcer, and age

VEINES-QOL VEINES-Sym
Original or external Intrinsic Original or external Intrinsic
SF12 Physical r = 0.58 r = 0.58 r = 0.43 r = 0.42
SF12 Mental r = 0.58 r = 0.57 r = 0.44 r = 0.44
Pain (0–100) r = −0.60 r = −0.58 r = −0.60 r = −0.59
Pain (five categories) (Kendall’s tau b) τ b  = −0.42 τ b  = −0.41 τ b  = −0.43 τ b  = −0.42
Pain or discomfort (three categories) τ b  = −0.41 τ b  = −0.40 τ b  = −0.40 τ b  = −0.39
Mobility (three categories) τ b  = −0.39 τ b  = −0.39 τ b  = −0.31 τ b  = −0.29
Problems with self-care (three categories) τ b  = −030. τ b  = −0.30 τ b  = −0.23 τ b  = −0.23
Interference with usual activities (three categories) τ b  = −0.41 τ b  = −0.42 τ b  = −0.25 τ b  = −0.25
Anxiety or depression (three categories) τ b  = −0.36 τ b  = −0.36 τ b  = −0.30 τ b  = −0.28
Log duration of ulcer at baseline r = −0.02 (P = 0.6) r = −0.03 (P = 0.6) r = −0.02 (P = 0.6) r = −0.02 (P = 0.7)
Log area of ulcer at baseline r=−0.10 (P = 0.03) r = −0.10 (P = 0.04) r = −0.09 (P = 0.07) r = −0.09 (P = 0.07)
Age r = 0.25 r = 0.24 r = 0.26 r = 0.26
1. All P < 0.0001 except duration and area of ulcer
2. r = product moment correlation coefficient, τ b  = Kendall’s tau b coefficient of rank correlation
3. acorrelation of score with generic quality of life scales, pain, and difficulties indicate convergent validity, lack of correlation or low correlation with variables which should not be related to quality of life, such as age and duration of ulcer, would indicate divergent validity 