condition mean min max ZT0-3 465.761742 465.761742 465.761742 ZT4-7 1566.5231935 1566.5231935 1566.5231935 ZT8-11 1090.932022 1090.932022 1090.932022 ZT12-15 605.5220395 605.5220395 605.5220395 ZT16-19 332.843091 332.843091 332.843091 ZT20-23 382.170697 382.170697 382.170697