condition mean min max ZT0-3 24.260663155 21.33301951 27.1883068 ZT4-7 27.8408312175 25.04937527 30.632287165 ZT8-11 39.83869448 33.339550415 46.337838545000004 ZT12-15 40.9670569775 32.338530065 49.59558389 ZT16-19 18.974521697 16.797788199 21.151255195 ZT20-23 7.219835085 5.30362361 9.13604656