Évaluation des points de référence de circonférence du cou pour la dénutrition.

My Question is that whether there is any cut-off point of Neck Circumference (NC) while assesing undernourished individuals in field based studies. As for my knowledge, i have only found NC cut-off for overweight/Normal individuals. And my second question is which cut-off can be best used to find out the sensitivity of NC in undernourished people?