condition mean min max ZT0-3 13.122702499999999 11.696805 14.5486 ZT4-7 8.460755 8.460755 8.460755 ZT8-11 11.84155 11.84155 11.84155 ZT12-15 0 0 0 ZT16-19 14.90635 14.90635 14.90635 ZT20-23 16.7639 16.7639 16.7639