[讨论]本月JJ中"percentage change in numbers of "到底如何理解？

jerry_su2000

应该是第二种解释，人数变化的百分比。

反正法：
如果是第一种解释，必须存在前后两个百分比，要定义这两个百分比，必须有一个新的范围，题中的这个新范围就是总人数。其实如果没有总人数这个范围，前后两个百分比就没法定义，但是Percentage change in number of的句子还是可以独立存在的。
下面这个话是google出来的：
"Percentage change in number of recorded incidents in 2002, compared with 2001"
这个话之后是一张表给出了这个变化的百分比。没有新的范围来定义前后两个百分比。我也想不出来一个合适的范围可以定义"recorded incidents"的百分比。
所以，没有新的范围引进，百分比的变化根本就不存在。推出应该是第二种理解。

这是我的理解，欢迎讨论。

shim

I just googled out an article published on http://jama.ama-assn.org/cgi/content/full/291/21/2600; please use Ctrl+F to find "percentage change in numbers of" as posted here below. You can also click the "table 3" to link to the relevant table. After carefully read through this article, I come to the conclusion that the latter definition should be right.

Trends and Percentage Change in Numbers of Underweight Children, 1990-2015
    

Table 3 presents estimates for 1990 and projections for 2015
        of the number of underweight children, and the relative percentage
        change with corresponding 95% CIs by geographical region. Worldwide,
        the number of underweight children was projected to decline
        from 163.8 million in 1990 to 113.4 million in 2015, a change
        of –31% (95% CI, –40% to –20%). In developed
        countries, the number was estimated to decline from 1.2 to 0.6
        million, a change of –54% (95% CI, –94% to 244).
        In developing regions, the number was forecasted to decline
        from 162.6 to 112.8 million, a change of –31% (95% CI,
        –40% to –20%).