This study was designed to develop predictive models for surgical outcome based on information available prior to @entity2649 surgery. Forty @entity1 underwent decompressive laminarthrectomy. Preop and 1-year postop evaluation included Waddell's nonorganic signs, CT scan, Waddell disability index, @entity1643 disability questionnaire, low back outcome score (LBOS), visual analog scale (VAS) for @entity158 intensity, and trunk strength testing. Statistical comparisons of data used adjusted error rates within families of predictors. Mathematical models were developed to predict outcome success using stepwise logistic regression and decision-tree methodologies (chi-squared automatic interaction detection, or CHAID). Successful outcome was defined as improvement in at least three of four criteria: VAS, LBOS, and @entity613 and @entity158 . Exact logistic regression analysis resulted in a three-predictor model. This model was more accurate in predicting unsuccessful outcome (negative predictive value 75.0%) than in successful outcome (positive predictive value 69.6%). A CHAID model correctly classified 90.1% of successful outcomes (positive predictive value 85.7%, negative predictive value 100%). The use of conservative surgical decompression for @entity2649 can be recommended, as it demonstrated a success rate similar to that of more invasive techniques. Given its physiologic and biomechanical advantages, it can be recommended as the surgical method of choice in this indication. Underlying subclinical vascular factors may be involved in the complaints of @entity612 @entity1 . Those factors should be investigated more thoroughly, as they may account for some of the failures of surgical relief. The CHAID decision tree appears to be a novel and useful tool for predicting the results of @entity612

A predictive model for outcome after conservative decompression surgery for lumbar XXXX .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity1643 :: ('MESH:D017116', 'Disease') :: ['Oswestry low back pain'] @entity612 :: ('MESH:D013130', 'Disease') :: ['spinal stenosis', 'spinal stenosis surgery'] @entity2649 :: ('MESH:C563613', 'Disease') :: ['lumbar stenosis'] @entity613 :: ('MESH:D007383', 'Disease') :: ['reductions in claudication'] @entity158 :: ('MESH:D010146', 'Disease') :: ['pain', 'leg pain']
@entity612 :: (MESH:D013130,Disease) :: ['spinal stenosis']
