Advanced Search

Study Preview



Study Title and Description

Effectiveness of a web-based brief alcohol intervention and added value of normative feedback in reducing underage drinking: a randomized controlled trial.



Key Questions Addressed
1 Evidence map
  • Comments Comments (
    0
    ) |

Primary Publication Information
  • Comments Comments (
    0
    ) |
TitleData
Title Effectiveness of a web-based brief alcohol intervention and added value of normative feedback in reducing underage drinking: a randomized controlled trial.
Author Spijkerman R., Roek MA., Vermulst A., Lemmers L., Huiberts A., Engels RC.
Country Department of Developmental Psychopathology, Behavioural Science Institute, Radboud University, Nijmegen, Netherlands. r.spijkerman@pwo.ru.nl
Year 2010
Numbers Pubmed ID: 21169172

Secondary Publication Information
There are currently no secondary publications defined for this study.


Extraction Form: Evidence Map
Arms
Number Title Description Comments
1 MI_b a Web-based brief alcohol intervention with normative feedback
  • Comments Comments (
    0
    ) |
2 MI_a a Web-based brief alcohol intervention without normative feedback
  • Comments Comments (
    0
    ) |
3 TAU
  • Comments Comments (
    0
    ) |

Design Details
Question... Follow Up Answer Follow-up Answer
Should this citation be included? Yes
  • Comments Comments (
    0
    ) |
Ages eligible (in years) 15
  • Comments Comments (
    0
    ) |
20
  • Comments Comments (
    0
    ) |
Total sample size (in all arms) 575
  • Comments Comments (
    0
    ) |
Age distribution of enrolled population (in years) 18.11 (con group)
  • Comments Comments (
    0
    ) |
  • Comments Comments (
    0
    ) |
Substance used Alcohol
  • Comments Comments (
    0
    ) |
Interventions studied? Behavioral
  • Comments Comments (
    0
    ) |
Outcome? Self report of use/abstinence and/or intensity
  • Comments Comments (
    0
    ) |
Age variation of enrolled population (in years) 1.59 (con group)
  • Comments Comments (
    0
    ) |
  • Comments Comments (
    0
    ) |
  • Comments Comments (
    0
    ) |
  • Comments Comments (
    0
    ) |
  • Comments Comments (
    0
    ) |
Study type RCT
  • Comments Comments (
    0
    ) |
Is any arm a brief intervention (or single session)? Yes
  • Comments Comments (
    0
    ) |
Income level of country(ies) of origin ... Country(ies) name(s) Unclear ... Web-based, could not find country information. Researchers based in the Netherlands
  • Comments Comments (
    0
    ) |




Results & Comparisons


Results Data
Outcome: heavy drinking days      Population: All Participants
Time Point Measure MI_b MI_a TAU


1 months

OR 0.74 0.44
CI_low 0.33 0.19
CI_high 1.62 0.99
N Analyzed 193 192


3 months

OR 0.55 0.77
CI_low 0.24 0.35
CI_high 1.26 1.68
N Analyzed 88 87
SE P-Value Beta (possibly net mean difference) SE P-Value Beta (possibly net mean difference)
Outcome: alcohol drinks      Population: All Participants Between-Arm Comparisons
Time Point Measure MI_b MI_a TAU Comparison Measure


1 months

SE 0.2 0.2 nr
Beta 0.25 0.37 nr
N Analyzed 193 192 190




SE
Beta
N Analyzed


3 months

SE nr nr nr
Beta 0.18 0.13 nr
N Analyzed 88 87 103


Quality Dimensions
Dimension Value Notes Comments
Intention-to-treat-analysis: Bias due to incomplete reporting and analysis according to group allocation Yes
  • Comments Comments (
    0
    ) |
Group similarity at baseline (selection bias): Selection bias due to dissimilarity at baseline for the most important prognostic indicators Yes
  • Comments Comments (
    0
    ) |
Co-interventions (performance bias): Performance bias because co-interventions were different across groups Yes None
  • Comments Comments (
    0
    ) |
Compliance (performance bias): Performance bias due to inappropriate compliance with interventions across groups Yes Brief intervention
  • Comments Comments (
    0
    ) |
Timing of outcome assessments (detection bias): Detection bias because important outcomes were not measured at the same time across groups Yes Same
  • Comments Comments (
    0
    ) |
Additional Bias: Bias due to problems not covered elsewhere in the table. If yes, describe them in the Notes. No
  • Comments Comments (
    0
    ) |
Random sequence generation (selection bias): Selection bias (biased allocation to interventions) due to inadequate generation of a randomized sequence Low
  • Comments Comments (
    0
    ) |
Allocation concealment (selection bias): Selection bias (biased allocation to interventions) due to inadequate concealment of allocations prior to assignment Low Online
  • Comments Comments (
    0
    ) |
Blinding of participants (performance bias): Performance bias due to knowledge of the allocated interventions by participants during the study High
  • Comments Comments (
    0
    ) |
Blinding of personnel/ care providers (performance bias): Performance bias due to knowledge of the allocated interventions by personnel/care providers during the study. N/A Low? "Provider" was an online program
  • Comments Comments (
    0
    ) |
Blinding of outcome assessor (detection bias): Detection bias due to knowledge of the allocated interventions by outcome assessors. High Self-reporting (online)
  • Comments Comments (
    0
    ) |
Incomplete outcome data (attrition bias): Attrition bias due to amount, nature or handling of incomplete outcome data Low Ignoring those who agreed but did not participate, 278/320 completed.
  • Comments Comments (
    0
    ) |
Selective Reporting (reporting bias): Reporting bias due to selective outcome reporting
  • Comments Comments (
    0
    ) |

Quality Rating
No quality rating data was found.