condition mean min max ZT0-3 2.695274 2.695274 2.695274 ZT4-7 0.7152735 0.7152735 0.7152735 ZT8-11 1.6270850000000001 1.6270850000000001 1.6270850000000001 ZT12-15 1.6715 1.6715 1.6715 ZT16-19 2.92254 2.92254 2.92254 ZT20-23 1.73344 1.73344 1.73344