condition mean min max ZT0-3 4.539865 4.539865 4.539865 ZT4-7 0.8151575 0.8151575 0.8151575 ZT8-11 10.009915 10.009915 10.009915 ZT12-15 14.25915 14.25915 14.25915 ZT16-19 13.80625 13.80625 13.80625 ZT20-23 5.852715 5.852715 5.852715