condition mean min max ZT0-3 40.339200000000005 32.62395 48.05445 ZT4-7 25.977800000000002 25.977800000000002 25.977800000000002 ZT8-11 38.29585 38.29585 38.29585 ZT12-15 0 0 0 ZT16-19 68.71245 68.71245 68.71245 ZT20-23 64.30785 64.30785 64.30785