condition mean min max ZT0-3 50.996300000000005 44.127300000000005 57.865300000000005 ZT4-7 30.5925 30.5925 30.5925 ZT8-11 51.2494 51.2494 51.2494 ZT12-15 0 0 0 ZT16-19 65.23465 65.23465 65.23465 ZT20-23 55.588899999999995 55.588899999999995 55.588899999999995