condition mean min max ZT0-3 7.50880392575 5.937560192 9.0800476595 ZT4-7 6.0274334815 5.942305578999999 6.112561384000001 ZT8-11 9.71684676 6.723861791500001 12.7098317285 ZT12-15 8.517993098 7.2924687425 9.7435174535 ZT16-19 9.4958876715 8.431403508 10.560371835 ZT20-23 12.37196443525 11.6375994305 13.10632944