What do systematic reviews say?

Episodes of sore throat of any severity Including as 1 episode the period post‐surgery) · Children with chronic/recurrent acute tonsillitis

Episodes of moderate/severe sore throat(subgroup of severely affected patients) Including as 1 episode the period post‐surgery) · Children with chronic/recurrent acute tonsillitis

Episodes of moderate/severe sore throat(subgroup of moderately affected patients) Not including as 1 episode the period post‐surgery · Children with chronic/recurrent acute tonsillitis

Sore throat · Children with chronic/recurrent acute tonsillitis

Time off school or work · Children with chronic/recurrent acute tonsillitis

Complications ‐ results not pooled · Children with chronic/recurrent acute tonsillitis

All‐cause mortality ‐ not reported · Children with chronic/recurrent acute tonsillitis

Quality of life ‐ results not pooled · Children with chronic/recurrent acute tonsillitis

Adverse events, complications and morbidity associated with (adeno)tonsillectomy and comparators Expressed as the proportion of children experiencing adverse events [12 months] · children with obstructive sleep‐disordered breathing

Adverse events, complications and morbidity associated with (adeno)tonsillectomy and comparators Expressed as the proportion of children experiencing a serious adverse event [7 months] · children with obstructive sleep‐disordered breathing

Adverse events, complications and morbidity associated with (adeno)tonsillectomy and comparators [6 months] · children with obstructive sleep‐disordered breathing

Disease‐specific quality of life or symptoms [mean total scores at 7 months] · children with obstructive sleep‐disordered breathing

Respiratory events during sleep as measured by the AHI using PSG [mean AHI at 12 months] · children with obstructive sleep‐disordered breathing

Respiratory events during sleep as measured by the AHI using PSG [mean AHI at 7 months] · children with obstructive sleep‐disordered breathing

Neurocognitive performance [7 months] · children with obstructive sleep‐disordered breathing

Attention [mean NEPSY at 7 months] · children with obstructive sleep‐disordered breathing

Behaviour [mean scores at 7 months] · children with obstructive sleep‐disordered breathing

Respiratory events during sleep as measured by the AHI using PSG [median AI at 6 months] · children with obstructive sleep‐disordered breathing

Disease‐specific quality of life or symptoms [mean score at 12 months] · children with obstructive sleep‐disordered breathing