condition mean min max ZT0-3 429.184936 429.184936 429.184936 ZT4-7 270.25426600000003 270.25426600000003 270.25426600000003 ZT8-11 313.1182865 313.1182865 313.1182865 ZT12-15 365.413501 365.413501 365.413501 ZT16-19 492.6325445 492.6325445 492.6325445 ZT20-23 457.002801 457.002801 457.002801