condition mean min max ZT0-3 1.954655 1.53994 2.7677300000000002 ZT4-7 1.26004 1.26004 1.26004 ZT8-11 2.996455 2.996455 2.996455 ZT12-15 3.8525150000000004 3.32682 4.37821 ZT16-19 5.238955 5.238955 5.238955 ZT20-23 4.521115 4.521115 4.521115