condition mean min max ZT0-3 0.8489451666666666 0.0 1.3402604999999999 ZT4-7 0.62132 0.62132 0.62132 ZT8-11 1.636505 1.636505 1.636505 ZT12-15 1.7923125 1.36205 2.222575 ZT16-19 0.7777175 0.7777175 0.7777175 ZT20-23 1.679454 1.679454 1.679454