title: Preliminary validity study of the pain disability index.
mesh_terms: D000328:Adult; D000368:Aged; D001416:Back Pain / Q000175:diagnosis* / Q000601:surgery; D004185:Disability Evaluation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis