condition mean min max ZT0-3 9.752875 9.752875 9.752875 ZT4-7 11.129251499999999 11.129251499999999 11.129251499999999 ZT8-11 12.765281 12.765281 12.765281 ZT12-15 13.2096345 13.2096345 13.2096345 ZT16-19 11.8529875 11.8529875 11.8529875 ZT20-23 11.9590325 11.9590325 11.9590325