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GTN: glyceryl trinitrate
| Improvement of ulcer/gangrene/localised ischaemic area | Expected frequency (%) | Observed frequency (%) | 95% confidence interval of observed % | p-value |
| Yes | 12.5 (50%) | 21 (84%) | 66.35 - 93.6 | 0.0005 |
| No | 12.5 (50%) | 4 (16%) | 6.40 - 34.65 |
