“…Stronger beliefs in the necessity of using inhalers were associated with better adherence in 14 out of 16 results [38,40,53,60,61,65,69,74,77,82], beliefs in their effectiveness in four out of seven results [35,40,52,53,77], and more broadly-framed positive beliefs in inhaler usefulness or benefits in one out of three results [34]. Having fewer concerns about medication was related to better adherence in nine out of 17 results [38,40,60,64,65,68,72,74], lower perceived side-effects in two out of four results [72,77], lower beliefs that medication in general is overused in one out of three results [60,77], and stronger beliefs in inhaler necessity relative to concerns in two out of three results [68,69,72]. Readiness to use inhalers showed positive associations to adherence in three results [37,61], indicators of self-efficacy in four out of nine results [32,35,40,57,65,68], and stronger adherence routines in three results [53,68,72].…”