condition mean min max ZT0-3 7.894428333333333 4.93879 10.250399999999999 ZT4-7 5.0614799999999995 5.0614799999999995 5.0614799999999995 ZT8-11 5.617235 5.617235 5.617235 ZT12-15 12.86425 10.789200000000001 14.9393 ZT16-19 12.384799999999998 12.384799999999998 12.384799999999998 ZT20-23 14.98675 14.98675 14.98675