condition mean min max ZT0-3 1.4110505 1.188766 1.633335 ZT4-7 1.6397149999999998 1.6397149999999998 1.6397149999999998 ZT8-11 5.789695 5.789695 5.789695 ZT12-15 0 0 0 ZT16-19 5.14447 5.14447 5.14447 ZT20-23 2.21644 2.21644 2.21644