condition mean min max ZT0-3 16.869500000000002 16.47465 17.26435 ZT4-7 11.73746 11.73746 11.73746 ZT8-11 12.1898 12.1898 12.1898 ZT12-15 0 0 0 ZT16-19 15.974 15.974 15.974 ZT20-23 16.0587 16.0587 16.0587