Table 1.
Results of statistical analyses
| df | χ2 value | P value | |
|---|---|---|---|
| Question 1: Changes in the overall amount of business | |||
| USA (31) vs. Canada (23) | 2 | 3.50 | 0.178 |
| USA (31) vs. Tokyo (77) | 2 | 44.8 | 4.17 × 10–11 |
| Canada (23) vs. Tokyo (77) | 2 | 65.1 | 2.09 × 10–16 |
| Question 2: Changes in the amount of business from new clients | |||
| USA (28) vs. Canada (22) | 2 | 21.5 | 2.81 × 10–6 |
| USA (28) vs. Tokyo (77) | 2 | 56.4 | 3.49 × 10–14 |
| Canada (22) vs. Tokyo (77) | 2 | 67.2 | 7.09 × 10–18 |
| Question 3: Proportion of the amount of business from new clients | |||
| USA (30) vs. Canada (22) | 5 | 15.7 | 0.00694 |
| USA (30) vs. Tokyo (77) | 5 | 29.3 | 8.90 × 10–6 |
| Canada (22) vs. Tokyo (77) | 5 | 41.2 | 6.60 × 10–9 |
| Question 4: Proportions of rodent species in Tokyo | |||
| Before (77) vs. After (77) | 2 | 0.030 | 1 |
The numbers of samples are shown in parentheses
Data were analyzed by Fisher’s exact test
df: degree of freedom