condition mean min max ZT0-3 30.682454805 30.65415159 30.71075802 ZT4-7 42.7338578975 42.272116615 43.19559918 ZT8-11 13.02575741725 8.379293599 17.6722212355 ZT12-15 11.44638937375 8.4739211325 14.418857615 ZT16-19 25.279557345 19.986085805000002 30.573028885 ZT20-23 51.118879372500004 41.88935628 60.348402465