What do systematic reviews say?

Internet‐based interventions vs usual care or no treatment

Internet‐based interventions showed no clear difference in total mortality compared with usual care or no care (low certainty).

• Internet‐based interventions for the secondary prevention of coronary heart disease 2015 · Cochrane Headline outcomes only
  OR 0.27 [0.04, 1.63]
  6 studies · 895 participants
  Low

Internet‐based interventions vs usual care or no treatment

Internet‐based interventions showed no clear difference in revascularisation compared with usual care or no care (low certainty).

• Internet‐based interventions for the secondary prevention of coronary heart disease 2015 · Cochrane Headline outcomes only
  OR 0.69 [0.37, 1.27]
  6 studies · 895 participants
  Low

Internet‐based interventions vs usual care or no treatment

• Internet‐based interventions for the secondary prevention of coronary heart disease 2015 · Cochrane Headline outcomes only
  no estimate extracted
  4 studies · 439 participants
  Low

Internet‐based interventions vs usual care or no treatment

• Internet‐based interventions for the secondary prevention of coronary heart disease 2015 · Cochrane Headline outcomes only
  no estimate extracted
  4 studies · 437 participants
  Low

Internet‐based interventions vs usual care or no treatment

• Internet‐based interventions for the secondary prevention of coronary heart disease 2015 · Cochrane Headline outcomes only
  no estimate extracted
  4 studies · 437 participants
  Low

Internet‐based interventions vs usual care or no treatment

• Internet‐based interventions for the secondary prevention of coronary heart disease 2015 · Cochrane Headline outcomes only
  no estimate extracted
  4 studies · 439 participants
  Low

Internet‐based interventions vs usual care or no treatment

• Internet‐based interventions for the secondary prevention of coronary heart disease 2015 · Cochrane Headline outcomes only
  no estimate extracted
  5 studies · 623 participants
  Low

Internet‐based interventions vs usual care or no treatment

• Internet‐based interventions for the secondary prevention of coronary heart disease 2015 · Cochrane Headline outcomes only
  no estimate extracted
  5 studies · 622 participants
  Low

Intervention not reported

The intervention probably leads to higher internet plus behavioural support versus non‐Internet‐based… (moderate certainty).

• Internet‐based interventions for smoking cessation 2017 · Cochrane Headline outcomes only
  RR 1.69 [1.3, 2.18]
  5 studies · 2334 participants
  Moderate

Intervention not reported

The intervention showed no clear difference in internet plus behavioural support versus non‐Internet‐based active… (moderate certainty).

• Internet‐based interventions for smoking cessation 2017 · Cochrane Headline outcomes only
  RR 1 [0.84, 1.18]
  4 studies · 2769 participants
  Moderate

Intervention not reported

The intervention showed no clear difference in comparisons between Internet interventions (programmes):… (moderate certainty).

• Internet‐based interventions for smoking cessation 2017 · Cochrane Headline outcomes only
  RR 1.1 [0.99, 1.22]
  7 studies · 14623 participants
  Moderate

Intervention not reported

The intervention showed no clear difference in comparisons between Internet interventions (messages):… (low certainty).

• Internet‐based interventions for smoking cessation 2017 · Cochrane Headline outcomes only
  RR 1.17 [0.97, 1.41]
  3 studies · 4040 participants
  Low

Intervention not reported

The review found no eligible studies for this question.

• Internet‐based interventions for smoking cessation 2017 · Cochrane Headline outcomes only
  no estimate extracted
  Studies not reported
  No studies found

Intervention not reported

The intervention may leads to higher interactive and tailored versus non‐active control Self‐report or… (low certainty).

• Internet‐based interventions for smoking cessation 2017 · Cochrane Headline outcomes only
  RR 1.15 [1.01, 1.3]
  8 studies · 6786 participants
  Low

Intervention not reported

The intervention showed no clear difference in internet versus active control Self‐report or bio‐verified smoking… (moderate certainty).

• Internet‐based interventions for smoking cessation 2017 · Cochrane Headline outcomes only
  RR 0.92 [0.78, 1.09]
  5 studies · 3806 participants
  Moderate