condition mean min max ZT0-3 9.39142 8.46129 10.321549999999998 ZT4-7 6.9786649999999995 6.9786649999999995 6.9786649999999995 ZT8-11 4.248435000000001 4.248435000000001 4.248435000000001 ZT12-15 0 0 0 ZT16-19 5.926515 5.926515 5.926515 ZT20-23 8.668105 8.668105 8.668105