condition mean min max ZT0-3 0.8242235 0.7926595000000001 0.8557874999999999 ZT4-7 0.5481815 0.5481815 0.5481815 ZT8-11 0.37289249999999996 0.37289249999999996 0.37289249999999996 ZT12-15 0 0 0 ZT16-19 0.365417 0.365417 0.365417 ZT20-23 0.955214 0.955214 0.955214