Main findings of the systematic review and meta-analysis of internet-based behavior change programs include: Internet-based interventions that also used text messages had large effects (bigger...

Extracted text: Main findings of the systematic review and meta-analysis of internet-based behavior change programs include: Internet-based interventions that also used text messages had large effects (bigger differences between treatment and control ) on behavior than Internet-based interventions that also used email O Interventions that didn't use theories or used them very little, tended to have larger effects (bigger differencees between treatment and control) on behavior than did interventions that used theories extensively All of the above O Interventions that used more techniques tended to have larger effects (bigger differences between treatment and control) on behavior than did interventions that used fewer techniques