Table 3 Comparison of possible confounding nominal variables between control and intervention systems,
Intervention | Control | P | ||
|---|---|---|---|---|
Gender | M | 647 | 592 | 0.118 |
F | 639 | 662 | ||
Education of main bread winner | Elementary or less | 96 | 95 | 0.192 |
Secondary | 254 | 195 | ||
High education | 134 | 130 | ||
Problems with sewage | N | 441 | 397 | 0.056 |
Y | 41 | 22 | ||
Problems with neighbours sewage | N | 446 | 385 | 0.755 |
Y | 34 | 27 | ||
Dogs | N | 185 | 194 | 0.014 |
Y | 300 | 226 | ||
Cats | N | 341 | 312 | 0.204 |
Y | 144 | 109 | ||
Rabbits | N | 41 | 18 | 0.01 |
Y | 443 | 404 | ||
Cattle | N | 30 | 24 | 0.739 |
Y | 454 | 399 | ||
Sheep | N | 6 | 6 | 0.811 |
Y | 479 | 417 | ||
Goats | N | 10 | 8 | 0.854 |
Y | 475 | 415 | ||
Pigs | N | 24 | 24 | 0.626 |
Y | 461 | 399 | ||
Birds | N | 187 | 134 | 0.029 |
Y | 297 | 289 | ||
Horses | N | 54 | 48 | 0.909 |
Y | 431 | 374 |