Fig. 2From: Instrumental variable analysis to estimate treatment effects: a simulation study showing potential benefits of conditioning on hospitalDistribution of the IV (treatment preferences) plotted per prognostic factor in the motivating example showing the distribution of the treatment preference of the hospitals attributed to each patient, per level of the prognostic factor: sex, Glasgow Coma Scale (GCS) motor score, pupillary reactivity, the Traumatic Coma Data Bank computed tomography (TCDB CT) scan classification, the presence of subarachnoid hemorrhages (SAH) and age. CT classification is based on the Marshall classificationBack to article page