Table 3.

Analysis for funnel plot asymmetry of studies reporting the different variables, estimated by Egger's regression test.

	No. studies	coefficient	90% CI	p-value
Knowledge, beliefs, perceptions (right vs misleading)	19	−2.21	−5.560 – 1.178	0.272
Attitudes/behaviors (positive vs negative)	18	−0.83	−3.508 – 1.843	0.595
Ethnicity (different vs local)	31	3.24	0.339 – 6.138	0.068
Socio-economic status (high vs low)	24	2.55	0.825 – 4.268	0.019
Information source/advice (sufficient vs insufficient)	11	6.64	2.140 – 11.137	0.024