condition mean min max ZT0-3 189.830938 189.830938 189.830938 ZT4-7 249.4019105 249.4019105 249.4019105 ZT8-11 193.698985 193.698985 193.698985 ZT12-15 176.455092 176.455092 176.455092 ZT16-19 71.097426 71.097426 71.097426 ZT20-23 76.69490350000001 76.69490350000001 76.69490350000001