condition mean min max ZT0-3 15.821558333333332 6.725705 33.7264 ZT4-7 84.38575 84.38575 84.38575 ZT8-11 51.6926 51.6926 51.6926 ZT12-15 22.5671 18.68515 26.44905 ZT16-19 22.21415 22.21415 22.21415 ZT20-23 16.215850000000003 16.215850000000003 16.215850000000003