condition mean min max ZT0-3 12.588899999999999 11.4787 13.6991 ZT4-7 11.48705 11.48705 11.48705 ZT8-11 14.618500000000001 14.618500000000001 14.618500000000001 ZT12-15 0 0 0 ZT16-19 15.64225 15.64225 15.64225 ZT20-23 12.0347 12.0347 12.0347