condition mean min max ZT0-3 26.011243185 22.103850110000003 29.91863626 ZT4-7 10.7492966575 9.808243138 11.690350177000001 ZT8-11 15.58414273225 11.4121491545 19.75613631 ZT12-15 22.653465 21.722522585 23.584407415 ZT16-19 18.23600905 17.803747965 18.668270135 ZT20-23 19.7871841725 19.48032491 20.094043435000003