condition mean min max ZT0-3 2.081337 1.195424 2.96725 ZT4-7 9.733765 9.733765 9.733765 ZT8-11 3.554525 3.554525 3.554525 ZT12-15 0 0 0 ZT16-19 4.34312 4.34312 4.34312 ZT20-23 5.8744700000000005 5.8744700000000005 5.8744700000000005