condition mean min max ZT0-3 8.02337 8.02337 8.02337 ZT4-7 11.0218575 11.0218575 11.0218575 ZT8-11 8.3800285 8.3800285 8.3800285 ZT12-15 8.5525475 8.5525475 8.5525475 ZT16-19 7.784311 7.784311 7.784311 ZT20-23 10.808962000000001 10.808962000000001 10.808962000000001