condition mean min max ZT0-3 12.28935 12.28935 12.28935 ZT4-7 11.9017 11.9017 11.9017 ZT8-11 8.83426 8.83426 8.83426 ZT12-15 9.691130000000001 9.691130000000001 9.691130000000001 ZT16-19 10.87266 10.87266 10.87266 ZT20-23 9.960415000000001 9.960415000000001 9.960415000000001