condition mean min max ZT0-3 12.685265 12.685265 12.685265 ZT4-7 12.3345325 12.3345325 12.3345325 ZT8-11 17.382558 17.382558 17.382558 ZT12-15 23.667196 23.667196 23.667196 ZT16-19 15.632464 15.632464 15.632464 ZT20-23 13.1854505 13.1854505 13.1854505