condition mean min max ZT0-3 709.827263 709.827263 709.827263 ZT4-7 440.30897949999996 440.30897949999996 440.30897949999996 ZT8-11 261.742373 261.742373 261.742373 ZT12-15 165.344651 165.344651 165.344651 ZT16-19 70.7223405 70.7223405 70.7223405 ZT20-23 54.5986725 54.5986725 54.5986725