condition mean min max ZT0-3 5.414047500000001 4.84853 5.979565 ZT4-7 7.39265 7.39265 7.39265 ZT8-11 6.03235 6.03235 6.03235 ZT12-15 0 0 0 ZT16-19 4.856529999999999 4.856529999999999 4.856529999999999 ZT20-23 6.003114999999999 6.003114999999999 6.003114999999999