Volume 13, Number 9—September 2007
Research
Landscape Elements and Hantaan Virus–related Hemorrhagic Fever with Renal Syndrome, People’s Republic of China
Lei Yan*1, Li-Qun Fang*1, Hua-Guo Huang*, Long-Qi Zhang*, Dan Feng†, Wen-Juan Zhao†, Wen-Yi Zhang†, Xiao-Wen Li*, and Wu-Chun Cao†1
Table 4
Result of multivariate logistic regression analysis in relation to HFRS occurrence in China, 1994–1998*
| p value | OR (95% CI) | |
|---|---|---|
| Elevation, m | ||
| <100 | – | 1.00 |
| 100–200 | 0.75 | 0.93 (0.61–1.43) |
| 201–500 | 0.47 | 0.87 (0.59–1.28) |
| 501–1,000 | <0.01 | 0.58 (0.39–0.86) |
| 1,001–1,500 | <0.01 | 0.27 (0.17–0.43) |
| 1,501–2,000 | <0.01 | 0.22 (0.12–0.39) |
| 2,001–3,000 | <0.01 | 0.31 (0.16–0.60) |
| >3,000 |
<0.01 |
0.05 (0.01–0.25) |
| NDVI | <0.01 | |
| <0.1 | – | 1.00 |
| 0.1–0.2 | 0.73 | 1.12 (0.60–2.11) |
| 0.2–0.3 | 0.25 | 1.44 (0.77–2.69) |
| >0.3 |
0.22 |
0.64 (0.32–1.29) |
| Precipitation, mm/y | <0.01 | |
| <400 | – | 1.00 |
| 400–800 | <0.01 | 9.94 (3.92–25.23) |
| 801–1,200 | <0.01 | 8.16 (2.97–22.44) |
| >1,200 |
<0.01 |
4.95 (1.70–14.39) |
| Annual cumulative air temperature, °C | <0.01 | |
| <1,600 | – | 1.00 |
| 1,600–3,400 | <0.01 | 0.47 (0.28–0.79) |
| 3,401–4,500 | 0.41 | 1.25 (0.73–2.15) |
| 4,501–8,000 | 0.17 | 1.58 (0.82–3.07) |
| >8,000 |
0.14 |
2.76 (0.71–10.72) |
| Soil or land-use type | ||
| Ferralisol | <0.01 | 0.65 (0.46–0.90) |
| Desert | <0.01 | 0.59 (0.41–0.84) |
| Skeletol primitive | <0.01 | 0.66 (0.50–0.88) |
| Semihydromorphic | <0.01 | 1.53 (1.14–2.06) |
| Alpine | <0.01 | 0.23 (0.07–0.73) |
| Timber forest | <0.01 | 2.04 (1.48–2.81) |
| Orchard | <0.01 | 1.97 (1.18–3.29) |
| Sparse woods | <0.01 | 0.60 (0.46–0.78) |
| Bare land | 0.02 | 0.45 (0.23–0.87) |
*HFRS, hemorrhagic fever with renal syndrome; NVDI, normalized difference vegetation index; OR, odds ratio; CI, confidence interval.
