Sensitivity and specificity of the Nijmegen score
Among the 103 patients evaluated using the Nijmegen questionnaire, 54 (52.4%) had a score ≥ 23. The Nijmegen score was higher in the group with a positive HVT than that with a negative HVT (23 [16-32] vs 20 [12-25.8], p = 0.04). The Nijmegen score correlated slightly with the HVT result (r = 0.2, p = 0.03).
The sensitivity of the Nijmegen score at the threshold of 23 was 56.3% and the specificity 56.3% compared to the HVT. The sensitivity and specificity of the Nijmegen score was also assessed for scores < 23. A Nijmegen score threshold < 23 improved sensitivity but reduced specificity (Table 3). The area under the ROC curve for the Nijmegen score was 0.63 [0.52-0.74] (p = 0.04) (Figure 3).