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. 2017 Nov 15;7(11):e018606. doi: 10.1136/bmjopen-2017-018606

Table 2A.

Quality assessment of studies including surveys

Author, year	Study addressed a clearly focused issue	Use of an appropriate method/randomisation (for RCTs)	Recruitment/comparability of study groups at baseline	Blinding (for RCTs)	Exposure measurement	Outcome measurement	Comparability of study groups during study (for RCTs)	Follow-up (for longitudinal studies)	Confounding factors (for non-RCTs)	Applicability to England	Overall
Baker et al, 2015¹⁵	***	†	**	n/a	n/a	**	n/a	n/a	*	*	Medium
Krska et al, 2016¹⁸	***	***	**	n/a	n/a	***	n/a	n/a	*	**	Medium
Loo et al, 2011¹⁹	***	***	**	n/a	n/a	n/a	n/a	n/a	*	**	Medium

***High.

**Medium.

*Low.

RCT, randomised controlled trial.