condition mean min max ZT0-3 63.967979305 62.838612499999996 65.09734611 ZT4-7 70.45912065499999 70.01349381 70.9047475 ZT8-11 69.52510941 69.20514016333334 69.84507865666666 ZT12-15 56.24209087833333 55.37191594666666 57.112265810000004 ZT16-19 55.503222115 55.397501553333335 55.608942676666665 ZT20-23 58.81078530833334 57.79433908 59.827231536666666