AtlasSession 4L11: Graphical representation of data and measures of associationp.35–38, 48–49
Other outcome types
- 2 earlier topics
- Summary statistics
- Summary measures by data type
- Tables
- Risk, odds, RR, OR, RD, NNT
- Other outcome types
Fig. 1
Diabetic foot ulcers treated with a dermal substitute: graft failure by HbA1c band against the < 6.5% band (patients)
Fig. 1. Two groups of patients, one dot each. Higher band: 6 failed out of 14. Below 6.5% (reference): 0 failed out of 40. Lit: everyone in each group. Dividing gives 35.53 times; the names for these are risk and risk ratio.
- Higher band: failed
- 6 out of 14
- Below 6.5% (reference): failed
- 0 out of 40
- Dividing (risk ratio)
- 35.53 times
- Subtracting (risk difference)
- about 42 more in every 100
2×2 Workbench · First look
Level 1 · First look · Lecture 11 · p.35–38, 48–49
Compare groups when the outcome is a measurement, an ordered exposure or a time, in plain words.
Choose the effect measure for quantitative, time-to-event and ordinal-exposure data, and tell 'effect size' (SMD) from 'effect measure'.
Average gap (the step you are on)
day-14 wound closure averages 72% vs 64%, an 8-point gap.
When the outcome is a measurement, compare the averages: day-14 wound closure averages 72% with the dermal substitute and 64% without, a gap of 72 − 64 = 8 points.