AtlasSession 4L11: Graphical representation of data and measures of associationp.9–12
Tables
Fig. 1
Knee cartilage defects: MSC-seeded collagen scaffold vs microfracture, ICRS repair grade at 12 months (knees)
Fig. 1. Two groups of knees, one dot each. MSC scaffold: 72 good out of 104. Microfracture: 48 good out of 96. Lit: everyone in each group. Dividing gives 1.38 times; the names for these are risk and risk ratio.
- MSC scaffold: good
- 72 out of 104
- Microfracture: good
- 48 out of 96
- Dividing (risk ratio)
- 1.38 times
- Subtracting (risk difference)
- about 19 more in every 100
2×2 Workbench · First look
Level 1 · First look · Lecture 11 · p.9–12
Read and fill a count table with totals on its edges, and compare groups with percentages.
Build a summary table and a contingency table with marginal totals, exposure on the rows, and report numbers to sensible decimal places or significant digits.
Tally grid (the step you are on)
Who ordered tea or coffee at breakfast and at lunch, with totals along the edges.
Tea or coffee, at breakfast or at lunch: a tally grid counts every order once, with totals along its edges. Here each knee is counted once, by arm (rows) and repair grade (columns).