The log improvement of water quality (TTC/100 ml) between household and source water modeled against adopters status and Pureit use, for each socio-economic tercile.

β are log improvements in water quality between the source and household point-of-use calculated using linear regression of log-transformed values.β为水源地与家庭户内使用点间的水质对数改善值，该值通过对经对数转换后的数值进行线性回归计算得到。