condition mean min max ZT0-3 10.183486 10.183486 10.183486 ZT4-7 11.3324265 11.3324265 11.3324265 ZT8-11 10.1814795 10.1814795 10.1814795 ZT12-15 9.839689499999999 9.839689499999999 9.839689499999999 ZT16-19 12.31658 12.31658 12.31658 ZT20-23 10.205022499999998 10.205022499999998 10.205022499999998