condition mean min max ZT0-3 9.809681 9.809681 9.809681 ZT4-7 10.9652085 10.9652085 10.9652085 ZT8-11 11.174217500000001 11.174217500000001 11.174217500000001 ZT12-15 10.791608499999999 10.791608499999999 10.791608499999999 ZT16-19 10.391545 10.391545 10.391545 ZT20-23 12.120789 12.120789 12.120789