condition mean min max ZT0-3 14.725384166666666 14.725384166666666 14.725384166666666 ZT4-7 18.6133 18.6133 18.6133 ZT8-11 17.61243 17.61243 17.61243 ZT12-15 23.392075 23.392075 23.392075 ZT16-19 7.4585300000000005 7.4585300000000005 7.4585300000000005 ZT20-23 5.61532 5.61532 5.61532