condition mean min max ZT0-3 0.33319299999999996 0.288505 0.37788099999999997 ZT4-7 0.679576 0.679576 0.679576 ZT8-11 0.1930375 0.1930375 0.1930375 ZT12-15 0 0 0 ZT16-19 0.284095 0.284095 0.284095 ZT20-23 0.1910245 0.1910245 0.1910245