condition mean min max ZT0-3 26.9053204 21.80852231 32.00211849 ZT4-7 34.188632687500004 33.062410650000004 35.314854725000004 ZT8-11 51.549230775 40.759649525 62.338812025 ZT12-15 74.6574528225 69.49226196500001 79.82264368 ZT16-19 66.728444845 57.331120535 76.125769155 ZT20-23 46.1268044825 39.200325095 53.05328387