condition mean min max ZT0-3 9.44141 9.44141 9.44141 ZT4-7 8.515825 8.515825 8.515825 ZT8-11 6.273305000000001 6.273305000000001 6.273305000000001 ZT12-15 7.353595 7.353595 7.353595 ZT16-19 9.736315000000001 9.736315000000001 9.736315000000001 ZT20-23 7.661385 7.661385 7.661385