Table 5.

Comparison of Pregnancy and lactation-related factors in fractured and non-fractured OI patients

	Fractures N = 12	No fracture N = 38	p
Age (years; mean ± SD)	32.7 ± 3.1	29.3 ± 5.0	0.002
Number of pregnancies (mean ± SD)	0.5 ± 0.9	0.6 ± 0.8	0.6
Time since last pregnancy (years, mean ± SD)	4.1 ± 2.7	4.4 ± 2.0	0.51
Duration of lactation after previous pregnancy (months, mean ± SD)	5.5 ± 8.6	2.55 ± 4.8	0.86
Breastfeeding (yes, %)*	12/14 (85.7%) Including 100% of patients with post-partum fractures	25/53 (47.1%)	0.03

* For pregnancy-related factors, data presented are the number of occurrence of each variable (e.g. breastfeeding) on the total number of pregnancies in each group