condition mean min max ZT0-3 52.86295 50.6936 55.0323 ZT4-7 69.26989999999999 69.26989999999999 69.26989999999999 ZT8-11 26.9678 26.9678 26.9678 ZT12-15 0 0 0 ZT16-19 39.8332 39.8332 39.8332 ZT20-23 58.95325 58.95325 58.95325