condition mean min max ZT0-3 11.807401 11.807401 11.807401 ZT4-7 14.853933000000001 14.853933000000001 14.853933000000001 ZT8-11 13.142012000000001 13.142012000000001 13.142012000000001 ZT12-15 12.06293 12.06293 12.06293 ZT16-19 12.907584499999999 12.907584499999999 12.907584499999999 ZT20-23 14.926109 14.926109 14.926109