Table 2.

Features included or excluded in the baseline models and in the novel models developed in this work. These features have been found to significantly impact post-implantation hearing performance in previous studies. Here, ✓indicates the feature is used in the model, and - indicates the feature is not used in the model. ${}^{*}$ Calculated as the difference of Age-CI and YRS-D. ${}^{**}$ Both WRS(HA) and PB ${}_{max}$ are used as pre-operative speech test measures.

Feature description	Baseline model A	Baseline model B	Baseline model C	Models in this work
Age at onset of s/p deafness (Age-D) ${}^{*}$	✓	✓	✓	✓
Duration of HA use (YRS-HA)	-	-	✓	✓
Etiology	✓	✓	-	✓
PTA ${}_i$	-	-	✓	✓
PTA ${}_{min}$	-	✓	-	✓
PTA ${}_c$	-	-	✓	✓
Duration of s/p deafness (YRS-D)	✓	✓	✓	✓
Age-CI	✓	✓	✓	✓
Pre-operative speech test ${}^{**}$	-	-	✓	✓
Native speaker	-	-	-	✓
Implant side	-	-	-	✓