Table 3

Improvement in PHQ-9 after lumbar decompression.

TimepointPHQ-9 Score, Mean ± SE P Valuea
Preoperative6.1 ± 0.5–
6 wk3.3 ± 0.4<0.001
12 wk3.9 ± 0.6<0.001
6 mo3.8 ± 0.5<0.001

  • Abbreviation: PHQ-9, Patient Health Questionnaire-9.

  • ↵a P values calculated using paired t test.