condition mean min max ZT0-3 25.780112 25.780112 25.780112 ZT4-7 56.374741 56.374741 56.374741 ZT8-11 35.485018 35.485018 35.485018 ZT12-15 21.4125965 21.4125965 21.4125965 ZT16-19 15.293165 15.293165 15.293165 ZT20-23 12.315914500000002 12.315914500000002 12.315914500000002