condition mean min max ZT0-3 2.2718949999999998 2.2708 2.27299 ZT4-7 3.94559 3.94559 3.94559 ZT8-11 4.26063 4.26063 4.26063 ZT12-15 0 0 0 ZT16-19 3.101965 3.101965 3.101965 ZT20-23 4.3796349999999995 4.3796349999999995 4.3796349999999995