condition mean min max ZT0-3 39.63475 32.8346 46.4349 ZT4-7 9.75965 9.75965 9.75965 ZT8-11 18.8652 18.8652 18.8652 ZT12-15 0 0 0 ZT16-19 30.365650000000002 30.365650000000002 30.365650000000002 ZT20-23 30.105449999999998 30.105449999999998 30.105449999999998