VVF Length Frequency Percent Valid >5 651 4.14 1 3915 24.87 2 4606 29.27 3 3128 19.87 4 2027 12.88 5 1141 7.25 Missing values 269 1.70 Errors/noises (<, 11, 22, 6) 4 0.02 Total 15741 100.00

Table 3: Statistical summary for the distribution of VVF length as presented in AAFH database.