Table 6.

Clusters for the records with text field (comments text) with positive and negative keywords

	Positive keywords	Negative keywords
C1	audio, mould, be34, be52, be36, unmask, be54, sil, ref, tsa, gp, ca, OTHERS, rt, suitabl, be201	masker, rev, tinnitu, appt, fta, help, review, aid, further, nfa, progress, 2000, ok, canc, counsel, cope, 2001, dna
C2	masker, rev, tinnitu, appt, fta, help, review, aid, further, nfa	audio, mould, be34, be52, be36, unmask, be54, sil, ref