condition mean min max ZT0-3 905.078437 905.078437 905.078437 ZT4-7 841.2105495000001 841.2105495000001 841.2105495000001 ZT8-11 1080.5197910000002 1080.5197910000002 1080.5197910000002 ZT12-15 1250.636368 1250.636368 1250.636368 ZT16-19 1248.6500065 1248.6500065 1248.6500065 ZT20-23 941.0945895 941.0945895 941.0945895