condition mean min max ZT0-3 2.28177 2.28177 2.28177 ZT4-7 2.0414849999999998 2.0414849999999998 2.0414849999999998 ZT8-11 1.312885 1.312885 1.312885 ZT12-15 1.116432 1.116432 1.116432 ZT16-19 2.705485 2.705485 2.705485 ZT20-23 2.35438 2.35438 2.35438