condition mean min max ZT0-3 30.9913 30.9913 30.9913 ZT4-7 25.759 25.759 25.759 ZT8-11 10.50919 10.50919 10.50919 ZT12-15 17.3292 17.3292 17.3292 ZT16-19 18.254399999999997 18.254399999999997 18.254399999999997 ZT20-23 34.24035 34.24035 34.24035