Sentence:  With due consideration for the limits of precision in assessing , expected rate of change in ossification of girls age 2 years , and the known <WSD>variations</WSD> in rate of ossification of these children as described in our preceding paper in the Supplement , each arrow with a `` shaft length '' of four months or less was selected as indicating `` same schedule '' at Onset and Completion , for this particular epiphysis . 
Meaning of the word marked with <WSD> tags:  an instance of change; the rate or magnitude of change