Fig. 1
Mice with full-thickness wounds: silver-loaded vs plain hydrogel dressing and wound infection by day 7 (mice)
Fig. 1. Two groups of mice, one dot each. Silver hydrogel: 6 infected out of 40. Plain hydrogel: 14 infected out of 40. Lit: everyone in each group. Dividing gives 0.43 times; the names for these are risk and risk ratio.
- Silver hydrogel: infected
- 6 out of 40
- Plain hydrogel: infected
- 14 out of 40
- Dividing (risk ratio)
- 0.43 times
- Subtracting (risk difference)
- about 20 fewer in every 100
2×2 Workbench · First look
Level 1 · First look · Foundations (ext)
Sort subjects by two yes/no questions into four boxes and count each box.
Fill and read a 2×2 table: the four cells, row and column totals, and the share with the outcome in each row.
ext A Foundations primer: written for beginners, not from the slides.
Four boxes (the step you are on)
Classmates sorted by 'has a dog?' and 'has a cat?' land in four boxes.
Classmates sorted by ‘has a dog?’ and ‘has a cat?’ land in four boxes. Each mouse answers two questions too, ‘silver dressing?’ and ‘infected?’: 6, 34, 14 and 26 mice in the four boxes.