condition mean min max ZT0-3 121.14753565 118.8402098 123.45486149999999 ZT4-7 43.41459063225 27.5336968045 59.29548446 ZT8-11 173.47862861724997 23.3402144545 323.61704277999996 ZT12-15 420.429975125 381.29969904999996 459.56025120000004 ZT16-19 293.2060826 260.2413396 326.1708256 ZT20-23 182.49617385 170.03097735 194.96137035