condition mean min max ZT0-3 12.2208 10.8418 13.5998 ZT4-7 10.819775 10.819775 10.819775 ZT8-11 10.065065 10.065065 10.065065 ZT12-15 0 0 0 ZT16-19 13.38515 13.38515 13.38515 ZT20-23 14.58275 14.58275 14.58275