Table 4. Joint association of obesity and glycemic control with incident abnormal uterine bleeding (AUB).

The joint-category analysis was exploratory. The BMI-by-HbA1c interaction was not statistically significant (P=0.271); therefore, these findings should not be interpreted as demonstrating multiplicative or biological interaction. 

HR=hazard ratio; CI=confidence interval; BMI=body mass index; HbA1c=glycated hemoglobin; AUB=abnormal uterine bleeding

Metabolic category	n/events	Adjusted HR (95% CI)	Wald χ²	P value
BMI <30 kg/m², HbA1c <8.5%	55/8	Reference	-	-
BMI ≥30 kg/m², HbA1c <8.5%	28/8	1.73 (0.71-4.23)	1.45	0.229
BMI <30 kg/m², HbA1c ≥8.5%	26/9	2.15 (0.91-5.10)	3.04	0.081
BMI ≥30 kg/m², HbA1c ≥8.5%	41/20	3.68 (1.65-8.23)	9.55	0.002