condition mean min max ZT0-3 2.4820399999999996 2.4820399999999996 2.4820399999999996 ZT4-7 2.1670499999999997 2.1670499999999997 2.1670499999999997 ZT8-11 0.998623 0.998623 0.998623 ZT12-15 2.58262 2.58262 2.58262 ZT16-19 2.2099450000000003 2.2099450000000003 2.2099450000000003 ZT20-23 2.890775 2.890775 2.890775