condition mean min max ZT0-3 14.301141666666666 5.885025 19.9419 ZT4-7 7.315695 7.315695 7.315695 ZT8-11 10.661765 10.661765 10.661765 ZT12-15 19.32085 15.15805 23.48365 ZT16-19 42.98695 42.98695 42.98695 ZT20-23 37.2329 37.2329 37.2329