condition mean min max ZT0-3 9.375066666666667 7.547795000000001 11.9881 ZT4-7 5.0396149999999995 5.0396149999999995 5.0396149999999995 ZT8-11 8.4604 8.4604 8.4604 ZT12-15 12.960075 12.645299999999999 13.27485 ZT16-19 12.7972 12.7972 12.7972 ZT20-23 13.092749999999999 13.092749999999999 13.092749999999999