Table 4.
Result of cluster analysis with number and mean of selected variables
| Characteristics | Number/mean/standard deviation (SD) | Cluster I | Cluster II |
|---|---|---|---|
| Ultrasound done | Number (%) | 1287 (32.7%) | 2646 (67.3%) |
| Gallbladder disease patients | Number (%) | 212 (89.1%) | 26 (10.9%) |
| Nickel in water | Mean | 7.7764 | 5.8857 |
| SD | 2.4604 | 4.7957 | |
| Cadmium in water | Mean | 2.8727 | 1.9228 |
| SD | 0.5589 | 0.9971 | |
| Chromium in water | Mean | 2.9600 | 0.5400 |
| SD | 2.5870 | 1.0208 | |
| DDT in water | Mean | 0.0358 | 0.0000 |
| SD | 0.0914 | 0.0000 | |
| Nickel in soil | Mean | 10.1841 | 10.9132 |
| SD | 2.4064 | 3.8223 | |
| Cadmium in soil | Mean | 0.8830 | 0.3479 |
| SD | 0.4999 | 0.1581 | |
| Chromium in soil | Mean | 5.3506 | 5.6970 |
| SD | 1.6430 | 4.7140 | |
| DDT in soil | Mean | 12.3089 | 0.1789 |
| SD | 28.5216 | 0.7532 | |
Metal and DDT content in water samples (µg/L) and in soil samples (µg/g).
Note: Levels of pollutants in water and soil between cluster I and cluster II were significantly different (P < 0.001).