condition mean min max ZT0-3 3.5503733333333334 2.364015 4.1514050000000005 ZT4-7 4.506684999999999 4.506684999999999 4.506684999999999 ZT8-11 12.284099999999999 12.284099999999999 12.284099999999999 ZT12-15 10.623275 9.8201 11.426449999999999 ZT16-19 7.60597 7.60597 7.60597 ZT20-23 5.70824 5.70824 5.70824