Dear Editor,

We would like to thank Professor Moran and Professor Zamorano [1] for their interest in our recently published research article [2]. Despite their occasional sharpness of tone, we appreciate their meticulous points and their interest in our paper. The current study was conducted using the data from anational survey carried out in South Korea during 2010 to 2011.

The reason for the difference between the total numbers in Tables 1 and 2 for was the unknown duration of breast-feeding in three participants who stated they had been breast-fed.

Diagnosis of osteoporosis was made using the World Health Organization T-score criteria; osteoporosis was defined as a T-score lower than −2.5 in either the femoral neck or the lumbar spine [3]. Some participants showed missing data for one of the two sites; however, if the T- score of the remaining site was lower than −2.5, osteoporosis was diagnosed. There were 927 participants who showed non-osteoporosis, 67 participants with osteoporosis in both the femoral neck and the lumbar spine, 185 participants with osteoporosis in the lumbar spine only (among them, three with missing data for femoral neck T- score), and 52 participants with osteoporosis in the femoral neck only (among them, 17 with missing data for lumbar spine T- score). This discrepancy explains the different figures in Table 2.