condition mean min max ZT0-3 1.8440596666666669 0.476024 2.7099 ZT4-7 1.5404845 1.5404845 1.5404845 ZT8-11 15.483699999999999 15.483699999999999 15.483699999999999 ZT12-15 13.928325000000001 11.6301 16.22655 ZT16-19 8.394255 8.394255 8.394255 ZT20-23 3.998445 3.998445 3.998445