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The use of the frequency of need to strain combined with patient reported strain duration to predict DD. LR < 0.2 was deemed to be useful in predicting CC patients without DD
| Frequency of need to strain (often/always) | Duration of strain | LR (95% CI) |
|---|---|---|
| Yes | >2 minutes | 1.85 (1.33–2.78) |
| No | <2 minutes | 0.99 (0.59–1.73) |
| No | >2 minutes | 0.86 (0.24–3.34) |
| Yes | <2 minutes | 0.04 (0.01–0.15) |
