condition mean min max ZT0-3 213.110713 213.110713 213.110713 ZT4-7 200.8553255 200.8553255 200.8553255 ZT8-11 179.270271 179.270271 179.270271 ZT12-15 188.08497649999998 188.08497649999998 188.08497649999998 ZT16-19 185.852729 185.852729 185.852729 ZT20-23 188.4647865 188.4647865 188.4647865