condition mean min max ZT0-3 26.0652 26.0652 26.0652 ZT4-7 27.651699999999998 27.651699999999998 27.651699999999998 ZT8-11 22.196649999999998 22.196649999999998 22.196649999999998 ZT12-15 19.66145 19.66145 19.66145 ZT16-19 19.841833333333334 19.841833333333334 19.841833333333334 ZT20-23 24.4083 24.4083 24.4083