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Table 2 Estimates of questionnaire diagnostic accuracy for different headache types

From: The burden of headache disorders in India: methodology and questionnaire validation for a community-based survey in Karnataka State

  Any headache Migraine TTH CDH
Sensitivity, % (95 % CI) 88 (83–91) 63 (52–72) 57 (48–65) 57 (48–65)
Specificity, % (95 % CI) 81 (74–87) 85 (81–89) 81 (76–86) 82 (76–86)
Positive predictive value, % (95 % CI) 89 (84–92) 55 (45–65) 61 (52–69 61 (52–69)
Negative predictive value, % (95 % CI) 80 (73–86) 89 (85–92) 79 (74–84) 79 (74–85)
Kappa value (95 % CI) 0.69 (0.61–0.76) 0.46 (0.35–0.56) 0.39 (0.29–0.49) 0.51 (0.24–0.79)
  1. Migraine and TTH include probable migraine and probable TTH, respectively