Contingency table showing the expected frequency of life threatening complications for different central line approaches
| Subclavian | Internal Jugular | Femoral | Row total | |
|---|---|---|---|---|
| Life threatening complications present | [70 × 30]/ 150 = 14 | [40 × 30]/ 150 = 8 | [40 × 30]/ 150 = 8 | 30 |
| No life threatening complications | [70 × 120]/ 150 = 56 | [40 × 120]/ 150 = 32 | [40 × 120]/ 150 = 32 | 120 |
| Column total | 70 | 40 | 40 | 150 |