condition mean min max ZT0-3 15.612824999999997 10.9507 20.274949999999997 ZT4-7 29.1389 29.1389 29.1389 ZT8-11 22.935000000000002 22.935000000000002 22.935000000000002 ZT12-15 0 0 0 ZT16-19 18.2194 18.2194 18.2194 ZT20-23 20.6102 20.6102 20.6102