condition mean min max ZT0-3 17.292475 13.8286 20.756349999999998 ZT4-7 47.169799999999995 47.169799999999995 47.169799999999995 ZT8-11 55.279650000000004 55.279650000000004 55.279650000000004 ZT12-15 0 0 0 ZT16-19 36.69005 36.69005 36.69005 ZT20-23 39.7179 39.7179 39.7179