condition mean min max ZT0-3 18.556413 18.556413 18.556413 ZT4-7 12.786946499999999 12.786946499999999 12.786946499999999 ZT8-11 11.548131 11.548131 11.548131 ZT12-15 12.208806 12.208806 12.208806 ZT16-19 10.9685935 10.9685935 10.9685935 ZT20-23 10.062622000000001 10.062622000000001 10.062622000000001