Selective Screening Strategies for Gestational Diabetes: A Prospective Cohort Observational Study

Table 2

β-Coefficient of predictive variables in the model with and without HbA1c.

	Model without HbA1c^1	Model with HBA1c^1
Previous baby ≥ 4 kg	102	1.01
Rgluc^2; Rgluc^3	1.99/; −2.1709	2.17/; −2.28
BMI^4	0.05	0.05
HbA1c^1	0.6464
R^2 coefficient of determination	0.135	0.122
Somer’s Dxy rank correlation	0.38	0.36
Harrell’s c-index	0.69	0.68
Brier score	0.176	0.174
NRI^5
Categorical	0.0355 ()
Continuous	0.253 ()
IDI^6	0.108 ()

HbA1c¹: glycated haemoglobin; Rgluc²: random glucose first spline; Rgluc³: random glucose second spline; BMI⁴: body mass index; NRI⁵: net reclassification index; IDI⁶: integrated discrimination improvement.