condition mean min max ZT0-3 10.557157474499999 9.769645459 11.34466949 ZT4-7 11.279157292 10.829877409 11.728437175 ZT8-11 9.83341946325 8.3304595445 11.336379382 ZT12-15 17.758305895 14.787879645 20.728732145000002 ZT16-19 23.49512546 21.880279705 25.109971215 ZT20-23 27.621520857500002 25.6932252 29.549816515