condition mean min max ZT0-3 1.38123 1.38123 1.38123 ZT4-7 0.47299599999999997 0.47299599999999997 0.47299599999999997 ZT8-11 0.7273795000000001 0.7273795000000001 0.7273795000000001 ZT12-15 1.0096055000000002 1.0096055000000002 1.0096055000000002 ZT16-19 2.259675 2.259675 2.259675 ZT20-23 1.500745 1.500745 1.500745