condition mean min max ZT0-3 13.72165661575 12.1888367815 15.25447645 ZT4-7 6.29365306075 6.239810588 6.3474955335 ZT8-11 8.40718045525 7.7552190195 9.059141891 ZT12-15 5.357518939499999 4.724828737499999 5.990209141499999 ZT16-19 6.49112373025 6.35380124 6.6284462205 ZT20-23 5.454639244500001 5.141354344000001 5.767924145