condition mean min max ZT0-3 10.331895 10.331895 10.331895 ZT4-7 10.083615 10.083615 10.083615 ZT8-11 6.39949 6.39949 6.39949 ZT12-15 14.754449999999999 14.754449999999999 14.754449999999999 ZT16-19 14.617750000000001 14.617750000000001 14.617750000000001 ZT20-23 7.3700399999999995 7.3700399999999995 7.3700399999999995