condition mean min max ZT0-3 412.051817 412.051817 412.051817 ZT4-7 595.2934319999999 595.2934319999999 595.2934319999999 ZT8-11 670.4575645 670.4575645 670.4575645 ZT12-15 759.0537975 759.0537975 759.0537975 ZT16-19 552.410197 552.410197 552.410197 ZT20-23 310.189539 310.189539 310.189539