Table 1.

Non-SDQ studies identified in the systematic search but excluded from the meta-analysis

Study	Reason for exclusion
Aplin [12]	Data not able to be compared with hearing controls
Aplin [13]	Data not able to be compared with hearing controls
Barker et al. [14]	Data not able to be compared with hearing controls
Bat-Chava and Deignan [15]	Data not able to be compared with hearing controls
Bat-Chava, Martin and Kosciw [16]	Data not able to be compared with hearing controls
Bizjak [17]	Behaviour measured with instrument of uncertain equivalence to those used in other studies
Freeman, Malkin, and Hastings [18]	Data not able to be compared with hearing controls
Gallaudet research institute [19]	Data not able to be compared with hearing controls
Hindley et al. [6]	Data not able to be compared with hearing controls
Keilman, Limberger, and Mann [20]	Data not able to be compared with hearing controls
Kent [21]	Behaviour measured with instrument of uncertain equivalence to those used in other studies
King, Mulhall, and Gullone [22]	Behaviour measured with instrument of uncertain equivalence to those used in other studies
Kouwenberg et al. [23]	Behaviour measured with instrument of uncertain equivalence to those used in other studies
Maes and Grietens [24]	Data not able to be compared with hearing controls
Polat [25]	Data not able to be compared with hearing controls