With the length of years in service, it shows that
most of spa business already exists for 4-6 years with
frequency of 28 or percentage of 37.30, some existed
for 1-3 years with frequency of 22 or percentage of
29.30, 7 – 9 years and 10 years and above with
frequency of 9 or percentage of 12.00 and below 1 year
with frequency of 7 or percentage of 9.30.