condition mean min max ZT0-3 0.49131545 0.2766599 0.705971 ZT4-7 0.5656815 0.5656815 0.5656815 ZT8-11 0.567707 0.567707 0.567707 ZT12-15 0 0 0 ZT16-19 0.6478685 0.6478685 0.6478685 ZT20-23 0.511019 0.511019 0.511019