condition mean min max ZT0-3 10.9531475 10.575095 11.331199999999999 ZT4-7 6.59682 6.59682 6.59682 ZT8-11 7.767295 7.767295 7.767295 ZT12-15 0 0 0 ZT16-19 9.12349 9.12349 9.12349 ZT20-23 9.69844 9.69844 9.69844