condition mean min max ZT0-3 254.408876 254.408876 254.408876 ZT4-7 352.52166850000003 352.52166850000003 352.52166850000003 ZT8-11 455.1179285 455.1179285 455.1179285 ZT12-15 391.3119435 391.3119435 391.3119435 ZT16-19 280.497057 280.497057 280.497057 ZT20-23 200.805856 200.805856 200.805856