Using appropriate pre-pregnancy body mass index cut points for obesity in the Chinese population: a retrospective cohort study

Table 4 Sensitivities, specificities and Youden indexes of the two obesity criteria in predicting the risk of adverse outcomes

	Sensitivity (%)		Specificity (%)		Youden index (95% CI)		Difference of Youden index (95% CI)
	BMI₂₅	BMI₂₈	BMI₂₅	BMI₂₈	BMI₂₅	BMI₂₈	Difference of Youden index (95% CI)
GDM	12.4	3.5	94.0	98.7	0.06 (0.05~0.08)	0.02 (0.01~0.03)	0.04 (0.03~0.06)^b
Preeclampsia	15.6	3.81	93.1	98.3	0.09 (0.05~0.13)	0.02 (0.01~0.04)	0.07 (0.03~0.10)^b
C/S	9.47	2.32	95.1	98.9	0.05 (0.04~0.06)	0.01 (0.01~0.02)	0.03 (0.03~0.04)^b
LGA	13.3	3.42	93.7	98.5	0.07 (0.05~0.09)	0.02 (0.01~0.03)	0.05 (0.04~0.07)^b
Obesity related outcomes^a	14.5	3.82	94.6	98.8	0.09 (0.08~0.11)	0.03 (0.02~0.03)	0.07 (0.05~0.08)^b

BMI body mass index; GDM gestational diabetes mellitus; C/S caesarean section; LGA large for gestational age;
CI confidence interval.
^aObesity related outcomes required at least one in the following items: GDM, preeclampsia, C/S, and LGA
^bThe difference of Youden index between the two groups was statistically significant

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