Figure 4 : Ordinal logistical regression was used to assess the association between ECOG at last follow-up
and categorical predictors WHO grade and extent of resection.

Statistical adjustments for sex and age were made. Score test was used to assess the proportional odds assumption.
WHO grade was significant a significant predictor (p=0.03). A WHO grade II-III had 13.54 times (95% CI 1.28–143.15) the
odds of receiving a higher score than WHO grade I.