condition mean min max ZT0-3 25.115067 25.115067 25.115067 ZT4-7 31.600692000000002 31.600692000000002 31.600692000000002 ZT8-11 31.270310000000002 31.270310000000002 31.270310000000002 ZT12-15 30.695313499999997 30.695313499999997 30.695313499999997 ZT16-19 35.042978000000005 35.042978000000005 35.042978000000005 ZT20-23 33.679961999999996 33.679961999999996 33.679961999999996