condition mean min max ZT0-3 419.41575 409.921 428.9105 ZT4-7 405.9715 405.9715 405.9715 ZT8-11 336.84900000000005 336.84900000000005 336.84900000000005 ZT12-15 0 0 0 ZT16-19 487.58299999999997 487.58299999999997 487.58299999999997 ZT20-23 530.978 530.978 530.978