condition mean min max ZT0-3 0.008924616666666666 0.0 0.01382365 ZT4-7 0.0 0.0 0.0 ZT8-11 0.026697449999999998 0.026697449999999998 0.026697449999999998 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0253644 0.0253644 0.0253644 ZT20-23 0.014566 0.014566 0.014566