condition mean min max ZT0-3 0.555925 0.335189 0.80857 ZT4-7 0.328379 0.328379 0.328379 ZT8-11 0.2841865 0.2841865 0.2841865 ZT12-15 0.749781 0.536435 0.9631270000000001 ZT16-19 0.26709099999999997 0.26709099999999997 0.26709099999999997 ZT20-23 0.4232495 0.4232495 0.4232495