condition mean min max ZT0-3 18.006104 18.006104 18.006104 ZT4-7 29.376229000000002 29.376229000000002 29.376229000000002 ZT8-11 36.070089499999995 36.070089499999995 36.070089499999995 ZT12-15 29.712155000000003 29.712155000000003 29.712155000000003 ZT16-19 24.099426 24.099426 24.099426 ZT20-23 18.8382035 18.8382035 18.8382035