Table 1.
Demographic characterization of R. norvegicus populations in the two campaigns of capture
| Rainy season |
Dry season |
||||
|---|---|---|---|---|---|
| Total n of rats | n (%) or Median (IQR) | Total n of rats | n (%) or Median (IQR) | p | |
| n of trapped rats | 179 | 120 | |||
| Age categories | 179 | 120 | |||
| Young (<200 g) | 40 (22·4) | 25 (20·8) | 0·87 | ||
| Subadult (200–399 g) | 113 (63·1) | 72 (60·0) | 0·67 | ||
| Adult (≥400 g) | 26 (14·5) | 23 (19·2) | 0·37 | ||
| Scaled mass index (Smi)a | 179 | 262·3 (236·6–289·0) | 120 | 272·9 (237·6–304·8) | 0·14 |
| Sex | 179 | 120 | |||
| Male | 87 (48·6) | 65 (54·2) | 0·41 | ||
| Female | 92 (51·4) | 55 (45·8) | 0·41 | ||
| Female | 92 | 55 | |||
| Placental scars | 44 (47·8) | 32 (58·2) | 0·30 | ||
| Pregnant | 33 (35·9) | 18 (32·7) | 0·84 | ||
| Lactating | 23 (25·0) | 20 (36·4) | 0·20 | ||
| Male | 87 | 65 | |||
| Scrotal testes | 77 (88·5) | 57 (87·7) | 1·00 | ||
| Coiled seminal vesicles | 72 (82·8) | 51 (78·5) | 0·65 | ||
IQR, Interquartile range.