condition mean min max ZT0-3 0.6266648333333333 0.423296 0.7851285 ZT4-7 0.638801 0.638801 0.638801 ZT8-11 0.329328 0.329328 0.329328 ZT12-15 0.72393175 0.719778 0.7280854999999999 ZT16-19 1.1009484999999999 1.1009484999999999 1.1009484999999999 ZT20-23 1.24804 1.24804 1.24804