condition mean min max ZT0-3 716.956197 716.956197 716.956197 ZT4-7 696.927183 696.927183 696.927183 ZT8-11 691.0075919999999 691.0075919999999 691.0075919999999 ZT12-15 811.9306065000001 811.9306065000001 811.9306065000001 ZT16-19 701.216096 701.216096 701.216096 ZT20-23 758.6422975 758.6422975 758.6422975