Comparison of the proportion of positive answers for each IHS criterion among headache sufferers interviewed by both lay interviewers and an expert
| IHS criteria | Lay | Expert | Agreement* | False positive† | False negative‡ | p Value§ |
|---|---|---|---|---|---|---|
| Values are per cent. *Agreement rate including positive and negative responses. †Proportion of subjects with the IHS criterion according to the lay interviewers and without it according to the expert. ‡Proportion of subjects with the IHS criterion according to the expert and without it according to the lay interviewers §McNemar test. IHS, International Headache Society. | ||||||
| At least five attacks during life | 98.0 | 98.5 | 96.5 | 1.5 | 2.0 | 0.71 |
| Attacks lasting 4 to 72 hours | 54.0 | 77.3 | 64.7 | 6.1 | 29.3 | <0.0001 |
| At least two of the headache characteristics below | 80.3 | 77.5 | 73.5 | 14.7 | 11.8 | 0.41 |
| Unilateral | 67.3 | 42.1 | 65.8 | 29.7 | 4.5 | <0.0001 |
| Pulsating | 36.3 | 41.7 | 69.1 | 12.8 | 18.1 | 0.17 |
| Moderate to severe | 89.2 | 89.7 | 87.7 | 5.9 | 6.4 | 0.84 |
| Aggravated by physical activity | 41.6 | 67.2 | 61.8 | 6.3 | 31.9 | <0.0001 |
| At least one associated symptom | 68.4 | 71.8 | 79.4 | 8.6 | 12.0 | 0.29 |
| Nausea and/or vomiting | 40.2 | 56.9 | 74,7 | 4.3 | 21/1 | <0.0001 |
| Photophobia and phonophobia | 59.8 | 65.6 | 75.1 | 9.6 | 15.3 | 0.096 |