condition mean min max ZT0-3 2.2372924999999997 2.120295 2.3542899999999998 ZT4-7 3.648355 3.648355 3.648355 ZT8-11 6.777515 6.777515 6.777515 ZT12-15 0 0 0 ZT16-19 4.906415 4.906415 4.906415 ZT20-23 2.9696499999999997 2.9696499999999997 2.9696499999999997