condition mean min max ZT0-3 10.388943333333334 6.64173 12.442499999999999 ZT4-7 2.4087 2.4087 2.4087 ZT8-11 0.3611535 0.3611535 0.3611535 ZT12-15 1.05248575 0.4093715 1.6956 ZT16-19 0.5114965 0.5114965 0.5114965 ZT20-23 3.331555 3.331555 3.331555