体重减轻和该病的发展速度成比例。
Loss of weight is directly proportional to the rate at which the disease is progressing.
世界卫生组织每年针对使用固体燃料进行烹饪的人口比例作出报告，以此作为评估卫生与发展方面取得进展的一项主要指标。
WHO reports annually on the proportion of the population using solid fuels for cooking as a key indicator for assessing progress in health and development.
1990至2008年间，世界上使用改良饮用水源的人口比例从77%上升到87%。 这一比率表明，可以按计划实现全球千年发展目标的饮水具体目标。
The percentage of the world’s population using improved drinking-water sources increased from 77% to 87% between 1990 and 2008, a rate on track with meeting the global MDG drinking-water target.
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