condition mean min max ZT0-3 1646.3 1646.3 1646.3 ZT4-7 503.3 503.3 503.3 ZT8-11 249.75 249.75 249.75 ZT12-15 102.94999999999999 102.94999999999999 102.94999999999999 ZT16-19 266.84999999999997 266.84999999999997 266.84999999999997 ZT20-23 1060.05 1060.05 1060.05