condition mean min max ZT0-3 13.337095 13.337095 13.337095 ZT4-7 19.368206 19.368206 19.368206 ZT8-11 13.498751 13.498751 13.498751 ZT12-15 13.4143995 13.4143995 13.4143995 ZT16-19 11.8875575 11.8875575 11.8875575 ZT20-23 12.3193315 12.3193315 12.3193315