Overall, 11% of Australians, or 1,837,000 people, were living in poverty in 1999. _______, aged people were the least likely to be poor, with poverty levels of 6% and 4% for single aged people and aged couples respectively.
Depending on the perception of the figure 11% and of the aged people, we have several groups. I list down a few.
Group 1 considers 11% low, and can have In particular (from @Jetunsaure) and Specifically.
Group 2 views the aged people to be normally poorer, and can have Unexpectedly and Surprisingly.
Group 3 views the aged people to be normally richer, and can have As expected.
Group 4 is less specific about those perceptions mentioned above, and can have Among them.
Among them can be in Group 1 too.
Edit
In particular can be in Group 4 too for leading readers from the overall information to data on sub-groups.