condition mean min max ZT0-3 0.6257923995 0.39877364200000004 0.852811157 ZT4-7 3.2992494125 2.691306419 3.907192406 ZT8-11 5.0772184849999995 5.005594010499999 5.1488429595000005 ZT12-15 5.50845608925 5.4356618795 5.581250299000001 ZT16-19 5.239766345 4.2065345585 6.2729981315 ZT20-23 8.04883894475 7.935035087 8.1626428025