condition mean min max ZT0-3 21.570983333333334 18.58165 26.66885 ZT4-7 15.371 15.371 15.371 ZT8-11 9.303945 9.303945 9.303945 ZT12-15 10.162957500000001 9.126115 11.1998 ZT16-19 9.506 9.506 9.506 ZT20-23 15.457749999999999 15.457749999999999 15.457749999999999