condition mean min max ZT0-3 4.2581299999999995 4.2581299999999995 4.2581299999999995 ZT4-7 3.7067699999999997 3.7067699999999997 3.7067699999999997 ZT8-11 5.50366 5.50366 5.50366 ZT12-15 9.939575000000001 9.939575000000001 9.939575000000001 ZT16-19 15.2152 15.2152 15.2152 ZT20-23 6.5424050000000005 6.5424050000000005 6.5424050000000005