condition mean min max ZT0-3 18.13573166666667 5.3075849999999996 42.85985 ZT4-7 23.38865 23.38865 23.38865 ZT8-11 0.8956310000000001 0.8956310000000001 0.8956310000000001 ZT12-15 0.358907 0.143402 0.5744119999999999 ZT16-19 0.06584995 0.06584995 0.06584995 ZT20-23 0.3212545 0.3212545 0.3212545