condition mean min max ZT0-3 165.292894 165.292894 165.292894 ZT4-7 174.361694 174.361694 174.361694 ZT8-11 185.47321699999998 185.47321699999998 185.47321699999998 ZT12-15 243.068667 243.068667 243.068667 ZT16-19 240.97819750000002 240.97819750000002 240.97819750000002 ZT20-23 292.4905465 292.4905465 292.4905465