condition mean min max ZT0-3 9.538025 9.538025 9.538025 ZT4-7 9.0360825 9.0360825 9.0360825 ZT8-11 9.150732 9.150732 9.150732 ZT12-15 10.1526055 10.1526055 10.1526055 ZT16-19 9.3393575 9.3393575 9.3393575 ZT20-23 9.224668999999999 9.224668999999999 9.224668999999999