condition mean min max ZT0-3 1.0817921257499998 0.9111429225000001 1.2524413289999998 ZT4-7 1.633815888 1.1217740566666667 2.1458577193333332 ZT8-11 12.473920257166666 8.599224817666666 16.348615696666666 ZT12-15 15.277602369333334 12.364647305333333 18.190557433333332 ZT16-19 14.547294440000002 13.704032960000001 15.39055592 ZT20-23 9.775466678499999 6.58404195 12.966891407