condition mean min max ZT0-3 9.7425625 9.401990000000001 10.083134999999999 ZT4-7 13.075849999999999 13.075849999999999 13.075849999999999 ZT8-11 20.32335 20.32335 20.32335 ZT12-15 0 0 0 ZT16-19 19.00875 19.00875 19.00875 ZT20-23 14.17075 14.17075 14.17075