condition mean min max ZT0-3 459.15000000000003 459.15000000000003 459.15000000000003 ZT4-7 429.6 429.6 429.6 ZT8-11 273.95 273.95 273.95 ZT12-15 140.15 140.15 140.15 ZT16-19 111.94999999999999 111.94999999999999 111.94999999999999 ZT20-23 174.05 174.05 174.05