condition mean min max ZT0-3 65.64013333333334 58.93185 69.29140000000001 ZT4-7 55.24955 55.24955 55.24955 ZT8-11 61.810649999999995 61.810649999999995 61.810649999999995 ZT12-15 61.69945 60.430350000000004 62.96854999999999 ZT16-19 61.7855 61.7855 61.7855 ZT20-23 71.29345 71.29345 71.29345