condition mean min max ZT0-3 32.586998535 28.50814134 36.66585573 ZT4-7 39.8125817875 33.83871319 45.786450385 ZT8-11 57.591235465000004 50.845240245 64.33723068500001 ZT12-15 69.5817276975 69.40136353 69.762091865 ZT16-19 68.00552926750001 67.10973181 68.901326725 ZT20-23 67.76012532249999 65.37856237999999 70.141688265