Table 4.
Training evaluation and device usability chi-square goodness of fit and 1-sample Wilcoxon signed-rank tests.
| Question topic | Minimum | Median | Maximum | Chi-square valuea | Chi-square significance | 1-Sample Wilcoxon signed-rank significanceb |
| Training session | 3 | 4 | 5 | 19.2 | 0.001 | 0 |
| Sample collection training | 2 | 4 | 5 | 34.4 | 0 | 0 |
| Sample seal training | 2 | 4 | 5 | 20.0 | 0 | 0 |
| Assembly training | 2 | 4 | 5 | 22.0 | 0 | 0 |
| Operate training | 3 | 4 | 5 | 23.2 | 0 | 0 |
| Assembly | 2 | 4 | 5 | 20.0 | 0 | 0 |
| Screen prompts | 3 | 4 | 5 | 33.6 | 0 | 0 |
| Words read | 3 | 4 | 5 | 42.8 | 0 | 0 |
| Color change | 2 | 4 | 5 | 33.2 | 0 | 0 |
| Interface similarity | 2 | 4 | 5 | 25.6 | 0 | 0 |
| Water collection | 3 | 4 | 5 | 29.6 | 0 | 0 |
| Water sample seal | 3 | 4 | 5 | 25.6 | 0 | 0 |
| Test kit insertion | 2 | 4 | 5 | 15.6 | 0.004 | 0 |
| Results read | 4 | 4 | 5 | 42.4 | 0 | 0 |
| Data transfer | 3 | 4 | 5 | 42.8 | 0 | 0 |
| Disassemble | 2 | 4 | 5 | 29.2 | 0 | 0 |
aNo cells (.0%) have expected frequencies less than 5. The minimum expected cell frequency is 5.0. Degrees of freedom for all chi-square goodness of fit tests are 4.0.
bAsymptotic significances are displayed for 1-sample Wilcoxon signed-rank tests. The significance level is .05.