condition mean min max ZT0-3 33.508581 33.508581 33.508581 ZT4-7 31.22643 31.22643 31.22643 ZT8-11 38.147892 38.147892 38.147892 ZT12-15 33.8774675 33.8774675 33.8774675 ZT16-19 35.102985000000004 35.102985000000004 35.102985000000004 ZT20-23 37.608355 37.608355 37.608355