BHUBANESWAR: Are some tribal groups in Koraput and Mayurbhanj on the brink? The answer seems to be in affirmative if the rate of child mortality among the tribals is any indication. The child mortality rate of the tribals in 1997-98 was 44 but it has surged to over 62 per 1000, says the latest study by Swami Vivekananda Youth Movement in association with the World Health Organisation.