Table 1.
Specification of the observed variables and latent risk factors.
| Observed Variable | Description of Observed Variable | Data Source | Period | Latent Risk Factor | % of Variance |
|---|---|---|---|---|---|
| X4 | Annual average precipitation (mm) | Meteorological Data Sharing Service System of China | 2002–2007 | Climatic factor | 93.2% |
| X7 | Annual average temperature (°C) | 2002–2007 | |||
| X8 | Annual average vapor pressure (Pa) | 2002–2007 | |||
| X9 | Annual average relative humidity (%) | 2002–2007 | |||
| X10 | Annual average minimum temperature (°C) | 2002–2007 | |||
| X11 | Annual average maximum temperature (°C) | 2002–2007 | |||
| X12 | Number of days in per year in which precipitation is greater than 0.1 mm (day) | 2002–2007 | Rainy day factor | 100% | |
| X5 | Average altitude (m) | 2002–2007 | Altitude factor | 98.7% | |
| X1 | Annual average air pressure (Pa) | 2002–2007 | |||
| X3 | Average longitude (degrees) | 2002–2007 | Longitude factor | 100% | |
| X15 | Air pollution index (API) | Ministry of Environmental Protection of China | 2002–2007 | Air quality | 100% |
| X16 | Per capita annual net income of rural residents (RMB yuan) | China Regional Economic Statistical Yearbook | 2002–2007 | Economic level | 88.2% |
| X17 | Per capita annual cost-of-living expense of rural residents (RMB yuan) | 2002–2007 | |||
| X18 | Per capita annual disposable income of urban residents (RMB yuan) | 2002–2007 | |||
| X19 | Per capita annual cost-of-living expense of urban residents (RMB yuan) | 2002–2007 | |||
| X20 | Per capita annual gross domestic product (RMB yuan) | 2002–2007 | |||
| X22 | Per capita annual fixed time deposit of urban and rural residents (RMB yuan) | 2002–2007 | |||
| X26 | Annual unemployment rate of urban residents (%) | 2002–2007 | Unemployment level | 100% | |
| X27 | Number of students per teacher of primary school | 2002–2007 | Education burden | 89.4% | |
| X28 | Number of students per teacher of ordinary high school | 2002–2007 | |||
| X30 | Population density (population/km2) | 2002–2007 | Population density | 100% | |
| X23 | Percentage of primary industry employees from the total number of employees (%) | 2002–2007 | Primary industry employment | 93.6% | |
| X36 | Percentage of primary industry employees from the total number of employees in rural areas (%) | 2002–2007 | |||
| X34 | Number of beds in medical institutions per thousand people | 2002–2007 | Health service | 97.3% | |
| X35 | Number of medical workers per thousand people | 2002–2007 |