condition mean min max ZT0-3 13.534659 13.534659 13.534659 ZT4-7 17.0837315 17.0837315 17.0837315 ZT8-11 15.434875 15.434875 15.434875 ZT12-15 13.860363 13.860363 13.860363 ZT16-19 17.309748 17.309748 17.309748 ZT20-23 22.773591500000002 22.773591500000002 22.773591500000002