Table 1.

Distribution of OI types in the study population of 175 families.

OI type	Number of families with COL1A1 variant	Number of families with COL1A2 variant	Total number of families with identified variant	Number of families without identified variant	Total
1	40	5	45 (42%)	51	96 (55%)
2	3	0	3 (3%)	0	3 (1%)
3	25	13	38 (35%)	6	44 (26%)
4	8	14	22 (20%)	10	32 (18%)
Total	76	32	108	67	175