condition mean min max ZT0-3 1.7482025 1.50071 1.995695 ZT4-7 7.37914 7.37914 7.37914 ZT8-11 2.952815 2.952815 2.952815 ZT12-15 0 0 0 ZT16-19 2.041525 2.041525 2.041525 ZT20-23 2.52736 2.52736 2.52736