Reviewer’s report
Title: 
Quantitative ultrasound assessment of the effect of parity on bone mineral
density in females
Version: 
2 
Date: 
11 May 2021
Reviewer's report:
There are many other factors which control the BMD of a woman other than age
BMI and parity. Mainly the nutritional factors, food habits and intake of Calcium
supplements during pregnancy and breast feeding. Further, there are medications
that can affect bone health. Were these factors considered in sample selection? 
BMD usually restore to normal levels with time after breast feeing period. Hence
the time (months/years) passed after stopping the breast feeding is an important
factor in this research. Please provide statistics of this. 
Though BUA alone is not a good parameter to measure BMD, the use of
Quantitative ultrasound bone scanners are emerging as they are free of radiation.
Please provide more evidence to justify the use of indicated cut-off values of
BUA to assess osteoporosis.
Table 1 - last three parameters- Calculation of total% is not correct. 
Please provide more statistics about regression model. 
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