condition mean min max ZT0-3 2.3068049999999998 2.3068049999999998 2.3068049999999998 ZT4-7 1.60438 1.60438 1.60438 ZT8-11 2.796075 2.796075 2.796075 ZT12-15 3.122 3.122 3.122 ZT16-19 2.64607 2.64607 2.64607 ZT20-23 1.9852349999999999 1.9852349999999999 1.9852349999999999