condition mean min max ZT0-3 269.05 269.05 269.05 ZT4-7 276.5 276.5 276.5 ZT8-11 331.45000000000005 331.45000000000005 331.45000000000005 ZT12-15 413.54999999999995 413.54999999999995 413.54999999999995 ZT16-19 428.9 428.9 428.9 ZT20-23 311.7 311.7 311.7