condition mean min max ZT0-3 273.4884783 257.49697569999995 289.4799809 ZT4-7 112.50628331250002 102.48963518000001 122.52293144500001 ZT8-11 61.98879395750001 60.23948549 63.73810242500001 ZT12-15 33.9309227725 27.153694225000002 40.70815132 ZT16-19 30.58022519 27.724303005000003 33.436147375 ZT20-23 43.7775712925 42.668728585 44.886414