condition mean min max ZT0-3 6.0296425 5.620945 6.43834 ZT4-7 7.166130000000001 7.166130000000001 7.166130000000001 ZT8-11 4.612295 4.612295 4.612295 ZT12-15 0 0 0 ZT16-19 4.39848 4.39848 4.39848 ZT20-23 7.855659999999999 7.855659999999999 7.855659999999999