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.
In the above sentences, I'd like to know a word/phrase to lead readers from the overall information to data on sub-groups that comes under the big one. Here, single aged people and aged couples are two sub-groups of Australians. Thanks a lot!