Table 3. Estimation of optimal cut-off point of grip-to-BMI ratio.

		%
	Cut-off point	Sensitivity	Specificity	Equation
Girls 4–9	0.569	52.9	78.9	0.266
	0.680	76.5	60.2	0.214
	0.711	94.1	53.4	0.221
Girls 10–14	0.831	42.9	94.8	0.329
	0.920	61.9	85.1	0.167
	1.091	81.0	59.1	0.203
Boys 4–9	0.354	25.0	99.6	0.563
	0.556	50.0	84.6	0.274
	0.721	75.0	57.7	0.241
Boys 10–14	0.853	41.7	97.3	0.341
	1.002	66.7	83.8	0.137
	1.040	91.7	80.2	0.046

Equation = (1—Sensitivity)² + (1—Specificity)²