condition mean min max ZT0-3 9.15194620675 8.8398626455 9.464029768 ZT4-7 3.3700758614999997 3.1652100725 3.5749416504999996 ZT8-11 5.518226708749999 4.002571768 7.0338816495 ZT12-15 6.1302371845 5.9541779965 6.3062963725 ZT16-19 4.47489116375 4.0397711395 4.910011188 ZT20-23 6.36653856975 5.9986386275 6.734438512