condition mean min max ZT0-3 19.7413580925 14.473658735 25.00905745 ZT4-7 11.9116711075 11.16042043 12.662921785 ZT8-11 15.065360312500001 12.98872373 17.141996895000002 ZT12-15 11.87315316675 9.230962023 14.515344310500002 ZT16-19 13.55383584 11.828241434999999 15.279430245 ZT20-23 20.473748597500002 17.62862322 23.318873975000002