condition mean min max ZT0-3 15.391300000000001 15.391300000000001 15.391300000000001 ZT4-7 6.780290000000001 6.780290000000001 6.780290000000001 ZT8-11 2.34082 2.34082 2.34082 ZT12-15 5.964785 5.964785 5.964785 ZT16-19 13.84985 13.84985 13.84985 ZT20-23 18.5014 18.5014 18.5014