condition mean min max ZT0-3 9.538025 9.538025 9.538025 ZT4-7 11.436259 11.436259 11.436259 ZT8-11 9.112146 9.112146 9.112146 ZT12-15 9.417129500000001 9.417129500000001 9.417129500000001 ZT16-19 9.635501999999999 9.635501999999999 9.635501999999999 ZT20-23 9.4340275 9.4340275 9.4340275