Tribal Affairs Minister Jual Oram said as per the National Family Health Survey data of 2005-06, child mortality rate among STs is 35.8, which is almost double than the national average of 18.4.
He said infant mortality rate among the STs is 62.1, which is higher than the national average of 57.
Oram said the higher mortality rate appears to be mainly due to low childhood immunisation amongst the STs, including particularly vulnerable tribal groups (PVTGs).
He said there has been decline in population of PVTGs of Kolam (Andhra Pradesh and Telangana), Koraga (Karnataka), Cholanaikayan (Kerala), Mal Paharia (Bihar), Kota (Tamil Nadu), Birhor (Odisha) and Shompen (Andaman and Nicobar Islands).
The reasons for the decline, the ministers said, have not been ascertained.