condition mean min max ZT0-3 40.336686 40.336686 40.336686 ZT4-7 43.9653665 43.9653665 43.9653665 ZT8-11 45.643676 45.643676 45.643676 ZT12-15 46.394051000000005 46.394051000000005 46.394051000000005 ZT16-19 44.880669999999995 44.880669999999995 44.880669999999995 ZT20-23 47.510958 47.510958 47.510958