condition mean min max ZT0-3 36.15756666666667 25.5291 47.18725 ZT4-7 18.1932 18.1932 18.1932 ZT8-11 17.61675 17.61675 17.61675 ZT12-15 27.312025 27.21445 27.409599999999998 ZT16-19 30.7121 30.7121 30.7121 ZT20-23 46.3456 46.3456 46.3456