Table 1.

Potential effect of the internet on physical activity interventions (based on effect estimates from web-based physical activity interventions and other physical activity interventions) and the potential effect of mobile phones on physical activity interventions (based on effect estimates from telephone-based physical activity interventions and from other physical activity interventions), by country income

	Low income	Middle income	Lower-middle income	Upper-middle income	High income
Internet
Overall
SME	0·01 (0·17)	0·06 (0·09)	0·02 (0·03)	0·06 (0·07)	0·12 (0·12)
Mean effect (min per week)	0·61 (1·20)	4·76 (5·99)	1·71 (2·32)	4·68 (4·50)	8·88 (7·42)
WPE (min per week)	0·07	3·44	0·62	1·68	1·46
Website interventions
SME	0·02 (0·03)	0·13 (0·13)	0·05 (0·05)	0·13 (0·08)	0·25 (0·11)
Community interventions
SME	0·01 (0·02)	0·11 (0·10)	0·04 (0·04)	0·11 (0·06)	0·20 (0·07)
Clinical interventions
SME, population-wide effect 2·6%	0·00 (0·00)	0·00 (0·00)	0·00 (0·00)	0·00 (0·00)	0·01 (0·00)
SME, population-wide effect 40%	0·01 (0·01)	0·04 (0·04)	0·02 (0·01)	0·04 (0·02)	0·08 (0·03)
SME, unadjusted	0·01 (0·02)	0·11 (0·09)	0·04 (0·04)	0·10 (0·06)	0·20 (0·07)
Mobile phones
Overall
SME	0·06 (0·07)	0·14 (0·14)	0·11 (0·14)	0·18 (0·16)	0·18 (0·17)
Mean effect (min per week)	4·37 (5·72)	10·96 (10·91)	8·22 (10·91)	13·52 (12·45)	14·03 (12·67)
WPE (min per week)	0·51	7·91	2·98	4·87	2·27
Telephone interventions
SME	0·19 (0·15)	0·48 (0·22)	0·36 (0·22)	0·60 (0·21)	0·62 (0·20)
Community interventions
SME	0·10 (0·07)	0·25 (0·09)	0·19 (0·09)	0·31 (0·06)	0·33 (0·04)
Clinical interventions
SME, population-wide effect 2·6%	0·00 (0·00)	0·01 (0·00)	0·00 (0·00)	0·01 (0·00)	0·01 (0·00)
SME, population-wide effect 40%	0·04 (0·03)	0·10 (0·03)	0·07 (0·04)	0·12 (0·02)	0·13 (0·02)
SME, unadjusted	0·10 (0·07)	0·25 (0·109)	0·18 (0·09)	0·30 (0·05)	0·32 (0·04)

Data in parentheses are SD. SME=standardised mean effect. WPE=potential effect weighted by population distribution.