Table 2 Inflammatory back pain (IBP) parameters, according to experts
1Age at onset <40 years
2Insidious onset
3Improvement with exercise
4No improvement with rest
5Pain at night (with improvement upon getting up)
  • Sensitivity 77.0% and specificity 91.7% if at least four out of five parameters are present. Note that sensitivity and specificity refer to the presence of IBP, not to diagnosis.