condition mean min max ZT0-3 10.112110000000001 10.1058 10.11842 ZT4-7 7.043355 7.043355 7.043355 ZT8-11 5.91695 5.91695 5.91695 ZT12-15 0 0 0 ZT16-19 5.71598 5.71598 5.71598 ZT20-23 8.738980000000002 8.738980000000002 8.738980000000002