condition mean min max ZT0-3 0.19405816666666667 0.097121 0.343146 ZT4-7 0.14079735 0.14079735 0.14079735 ZT8-11 0.3900655 0.3900655 0.3900655 ZT12-15 0.376991575 0.31343415 0.44054899999999997 ZT16-19 0.277942 0.277942 0.277942 ZT20-23 0.37053450000000004 0.37053450000000004 0.37053450000000004