condition mean min max ZT0-3 11.805043 11.805043 11.805043 ZT4-7 11.957726000000001 11.957726000000001 11.957726000000001 ZT8-11 12.9403365 12.9403365 12.9403365 ZT12-15 11.605606 11.605606 11.605606 ZT16-19 12.788515 12.788515 12.788515 ZT20-23 11.135973499999999 11.135973499999999 11.135973499999999