condition mean min max ZT0-3 2.706755 2.518955 2.9553849999999997 ZT4-7 1.512205 1.512205 1.512205 ZT8-11 1.81582 1.81582 1.81582 ZT12-15 2.623 2.274045 2.971955 ZT16-19 2.28748 2.28748 2.28748 ZT20-23 3.4328849999999997 3.4328849999999997 3.4328849999999997