Fig. 3.

Flow chart of data availability for classification of each index variable in the entire cohort (N = 1054). Insufficient information demonstrates an indication that testing, steroid use or onset documentation exists in the record but not enough information is provided to allow for phenotype prediction for the index variable. Intermediate classifies all cases whose values fall in between the designated cut-offs for BMD and DMD (e.g. Western Blot Dystrophin between 5% and 20%). Intermediate categories for the remaining index variables can be determined using Table 1. WB – Western Blot, DMD – Duchenne muscular dystrophy, BMD – Becker muscular dystrophy.