condition mean min max ZT0-3 0.16849333333333336 0.0 0.36145950000000004 ZT4-7 0.1400305 0.1400305 0.1400305 ZT8-11 2.674265 2.674265 2.674265 ZT12-15 3.0358475 2.27985 3.7918450000000004 ZT16-19 1.86619 1.86619 1.86619 ZT20-23 0.7720940000000001 0.7720940000000001 0.7720940000000001