condition mean min max ZT0-3 11.311203 11.311203 11.311203 ZT4-7 10.2734965 10.2734965 10.2734965 ZT8-11 9.755162 9.755162 9.755162 ZT12-15 10.194036 10.194036 10.194036 ZT16-19 10.4193345 10.4193345 10.4193345 ZT20-23 11.403876499999999 11.403876499999999 11.403876499999999