Do mass media campaigns improve physical activity? a systematic review and meta-analysis

Table 3 P-values for meta-regression analyses by study characteristics

Variable	Reduction in sedentary lifestyle (6 comparisons)	Sufficient physical activity (4 comparisons)
Mean age	0.054	0.326
Sex	0.104	0.885
Medium	0.159	0.171
Approach^a	0.033	0.813
Whether ads were paid	-^b	0.970
Percent coverage	0.697	0.449
Scope	0.712	0.759
Duration of intervention	0.718	0.707
Duration of follow-up	0.552	0.297
Quality	0.119	0.447

^a Campaigns based on ‘social norms’ versus those using either celebrities or a risk message.
^b There were not enough observations for this meta-regression.

ISSN: 2049-3258