condition mean min max ZT0-3 1.76045 1.76045 1.76045 ZT4-7 0.7016684999999999 0.7016684999999999 0.7016684999999999 ZT8-11 1.329888 1.329888 1.329888 ZT12-15 0.8385750000000001 0.8385750000000001 0.8385750000000001 ZT16-19 1.91035 1.91035 1.91035 ZT20-23 1.24932 1.24932 1.24932