condition mean min max ZT0-3 9.707831 9.707831 9.707831 ZT4-7 10.39263 10.39263 10.39263 ZT8-11 10.300686 10.300686 10.300686 ZT12-15 9.593485999999999 9.593485999999999 9.593485999999999 ZT16-19 10.8217455 10.8217455 10.8217455 ZT20-23 10.930952999999999 10.930952999999999 10.930952999999999