condition mean min max ZT0-3 9.29503 9.29503 9.29503 ZT4-7 7.832915 7.832915 7.832915 ZT8-11 7.48766 7.48766 7.48766 ZT12-15 8.897165000000001 8.897165000000001 8.897165000000001 ZT16-19 9.680575000000001 9.680575000000001 9.680575000000001 ZT20-23 8.36565 8.36565 8.36565