condition mean min max ZT0-3 19.44996666666667 11.56235 24.478450000000002 ZT4-7 11.076295 11.076295 11.076295 ZT8-11 10.375820000000001 10.375820000000001 10.375820000000001 ZT12-15 15.122975 14.36125 15.8847 ZT16-19 17.9718 17.9718 17.9718 ZT20-23 26.551299999999998 26.551299999999998 26.551299999999998