condition mean min max ZT0-3 0.969336 0.755127 1.183545 ZT4-7 1.154425 1.154425 1.154425 ZT8-11 0.974784 0.974784 0.974784 ZT12-15 0 0 0 ZT16-19 1.267212 1.267212 1.267212 ZT20-23 1.076879 1.076879 1.076879