condition mean min max ZT0-3 4.8892299999999995 4.601835 5.3668 ZT4-7 8.481110000000001 8.481110000000001 8.481110000000001 ZT8-11 5.0920950000000005 5.0920950000000005 5.0920950000000005 ZT12-15 5.57599 5.455954999999999 5.696025000000001 ZT16-19 4.3071 4.3071 4.3071 ZT20-23 5.716545 5.716545 5.716545