condition mean min max ZT0-3 59.797959 59.797959 59.797959 ZT4-7 70.38197650000001 70.38197650000001 70.38197650000001 ZT8-11 56.5679765 56.5679765 56.5679765 ZT12-15 67.877224 67.877224 67.877224 ZT16-19 51.4968595 51.4968595 51.4968595 ZT20-23 60.608389 60.608389 60.608389