condition mean min max ZT0-3 516.474475 516.474475 516.474475 ZT4-7 573.9623225 573.9623225 573.9623225 ZT8-11 606.0473775 606.0473775 606.0473775 ZT12-15 694.2494815 694.2494815 694.2494815 ZT16-19 501.839558 501.839558 501.839558 ZT20-23 530.6778225 530.6778225 530.6778225