condition mean min max ZT0-3 1.507019 1.507019 1.507019 ZT4-7 3.004006 3.004006 3.004006 ZT8-11 2.142662 2.142662 2.142662 ZT12-15 1.4423599999999999 1.4423599999999999 1.4423599999999999 ZT16-19 2.997254 2.997254 2.997254 ZT20-23 2.411459 2.411459 2.411459