condition mean min max ZT0-3 1.647055 1.50805 1.78606 ZT4-7 2.52904 2.52904 2.52904 ZT8-11 2.010635 2.010635 2.010635 ZT12-15 0 0 0 ZT16-19 2.57134 2.57134 2.57134 ZT20-23 2.7834849999999998 2.7834849999999998 2.7834849999999998