condition mean min max ZT0-3 546.924742 546.924742 546.924742 ZT4-7 444.5021755 444.5021755 444.5021755 ZT8-11 107.5879705 107.5879705 107.5879705 ZT12-15 76.21437949999999 76.21437949999999 76.21437949999999 ZT16-19 23.285711499999998 23.285711499999998 23.285711499999998 ZT20-23 39.8663675 39.8663675 39.8663675