condition mean min max ZT0-3 59.22415 59.22415 59.22415 ZT4-7 58.34765 58.34765 58.34765 ZT8-11 52.445800000000006 52.445800000000006 52.445800000000006 ZT12-15 57.272400000000005 57.272400000000005 57.272400000000005 ZT16-19 49.328900000000004 49.328900000000004 49.328900000000004 ZT20-23 60.287 60.287 60.287