condition mean min max ZT0-3 19.78845 19.78845 19.78845 ZT4-7 23.01725 23.01725 23.01725 ZT8-11 18.48545 18.48545 18.48545 ZT12-15 16.254849999999998 16.254849999999998 16.254849999999998 ZT16-19 14.8688 14.8688 14.8688 ZT20-23 19.04245 19.04245 19.04245