Preconception underweight impact on postnatal osteoporotic fracture: a retrospective cohort study using Japanese claims data

Table 3 Factors associated with osteoporotic fractures occurring within 2 years after delivery

	HR	(95% CI)	P-value	aHR†	(95% CI)	P-value
Age at delivery
20 to less than 30	Ref			Ref
30 to less than 40	1.7	(0.62, 4.86)	0.2992	1.1	(0.36, 3.04)	0.9287
Over 40	2.0	(0.65, 6.43)	0.2198	0.9	(0.27, 3.27)	0.9169
BMI
Over 18.5	Ref			Ref
Less than 18.5	1.8	(1.01, 3.34)	0.048‡	1.3	(0.60, 2.73)	0.5295
Alcohol intake everyday (ref: No)	1.6	(0.58, 4.60)	0.3523	1.9	(0.65, 5.32)	0.2488
Habitual smoking (ref: No)	0.9	(0.28, 2.92)	0.8641	0.6	(0.15, 2.68)	0.5348
Caesarean section (ref: No)	1.7	(0.94, 2.97)	0.0802	1.5	(0.75, 308)	0.2440

aHR, adjusted hazard ratio; BMI, body mass index; HR, hazard ratio; Ref, reference; CI, confidence interval. † Adjusted HR and 95% CIs were calculated by multiple categorical logistic regression analysis using the age at delivery, BMI, alcohol intake every day, habitual smoking, and caesarean section as adjusted variables. ‡ statistically significant

ISSN: 1471-2393