condition mean min max ZT0-3 17.0051530675 13.51360822 20.496697915 ZT4-7 18.507519115 18.047883355 18.967154875 ZT8-11 14.832220815500001 13.982124951000001 15.68231668 ZT12-15 8.82630890625 7.4122208625 10.240396950000001 ZT16-19 6.194675608 6.182609432 6.206741784 ZT20-23 6.59591006175 6.5581124975 6.633707626