Model probabilities and costs.

A standard deviation of 25% of the mean was assumed for the percentage increases for contingent NIPT and universal NIPT uptake. As standard practice, normal distributions of probabilities were approximated with beta distributions. Normal distributions of costs were approximated with gamma distributions
Model probabilities and costs.

针对有条件无创产前基因检测（contingent NIPT）与普适性无创产前基因检测（universal NIPT）的参与率增幅，我们假设其标准差为均值的25%。遵循标准操作规范，概率的正态分布采用贝塔分布进行近似拟合；成本的正态分布则采用伽马分布进行近似拟合。
模型概率与成本。