condition mean min max ZT0-3 12429.836000000001 12429.836000000001 12429.836000000001 ZT4-7 9944.904999999999 9944.904999999999 9944.904999999999 ZT8-11 3844.168333333333 3844.168333333333 3844.168333333333 ZT12-15 6784.434 6784.434 6784.434 ZT16-19 12164.395 12164.395 12164.395 ZT20-23 17706.96 17706.96 17706.96