condition mean min max ZT0-3 12.59915 10.77135 14.0808 ZT4-7 6.256425 6.256425 6.256425 ZT8-11 6.780695 6.780695 6.780695 ZT12-15 15.291975 14.40095 16.183 ZT16-19 9.53234 9.53234 9.53234 ZT20-23 20.5201 20.5201 20.5201