condition mean min max ZT0-3 0.23077399999999998 0.1842245 0.28604799999999997 ZT4-7 0.12877650000000002 0.12877650000000002 0.12877650000000002 ZT8-11 0.5072055 0.5072055 0.5072055 ZT12-15 0.5955035 0.567414 0.6235930000000001 ZT16-19 0.1895555 0.1895555 0.1895555 ZT20-23 0.30568399999999996 0.30568399999999996 0.30568399999999996