condition mean min max ZT0-3 5.11181 5.11181 5.11181 ZT4-7 3.9256849999999996 3.9256849999999996 3.9256849999999996 ZT8-11 4.581305 4.581305 4.581305 ZT12-15 5.041855 5.041855 5.041855 ZT16-19 5.686014999999999 5.686014999999999 5.686014999999999 ZT20-23 5.21542 5.21542 5.21542