Table 2e.

Subjective symptoms and other measurements with a follow-up period of minimum 6 months

Publication	Symptoms	ETDQ-7 (symptom-specific mean, preoperatively → postoperatively	Other
Poe et al., 2011 [13]	NR	NR	Mean mucosal inflammation score 2.91 → 1.73 (scale 1–4). p=0.003 View to ET lumen postoperatively: <4 mm if treated with 8 bar, at least 4 mm but not up to isthmus if treated with 10 bar, isthmus visible in 83 patients,33% of those who were treated with 12 bar, p=0.004 (for full dilation associated with 12 bar)
McCoul et al., 2012 [14]	NR	4.5 → 2.8, p<0.001	SNOT-22 mean 51.4 → 30.0, p=0.001
Bast et al., 2013 [15]	NR	NR	Improvement in total score (p = 0.001) and the subscores “general health” (p=0.001) and “physical health” (p=0.039) of GBI
Liang et al., 2016 [12]	NR	NR	NR
Bowles et al., 2017 [16]	NR	4.9 → 2.0, p<0.0001	NR

p-values taken from publication if given. ET, Eustachian tube; ETDQ-7, Eustachian Tube Dysfunction Questionnaire; GBI, Glasgow Benefit Inventory; NR, not reported; SNOT-22, Sino-Nasal Outcome Test.