condition mean min max ZT0-3 19.4083 18.896250000000002 19.78405 ZT4-7 12.468 12.468 12.468 ZT8-11 12.3446 12.3446 12.3446 ZT12-15 30.117774999999998 28.32465 31.910899999999998 ZT16-19 33.448100000000004 33.448100000000004 33.448100000000004 ZT20-23 22.17635 22.17635 22.17635