condition mean min max ZT0-3 1651.969943 1651.969943 1651.969943 ZT4-7 1520.442404 1520.442404 1520.442404 ZT8-11 1774.7190540000001 1774.7190540000001 1774.7190540000001 ZT12-15 1932.236245 1932.236245 1932.236245 ZT16-19 1923.742485 1923.742485 1923.742485 ZT20-23 1646.711475 1646.711475 1646.711475