<p>The authors of the paper “Online Alcohol Assessment and Feedback for Hazardous and Harmful Drinkers: Findings From the AMADEUS-2 Randomized Controlled Trial of Routine Practice in Swedish Universities” (J Med Internet Res 2015;17(7):e170) used the wrong variable for the number of email reminders before participants answered the follow-up. In <xref ref-type="table" rid="table2">Table 2</xref>, the values in columns two, three, and four under the subcategory "Number of follow-up emails before response, n (%)" should read as in the table below. A footnote has also been added to the <italic>P</italic>-value associated with this variable. In the Results section, there remains no statistically significant association between the primary outcome and the number of email reminders (<italic>P</italic>=.16), consistent with the missing at random (MAR) assumption. However, analyses using the repeated attempts model and linear regression suggested an intervention effect of an 11% reduction (18% reduction to 3% reduction) and a statistically significant departure from the MAR assumption. The authors are unable to explain why this result contradicts the above analysis that uses the same variables, so they prefer to trust the simpler model and hence they do not regard the repeated attempts model findings as providing any strong evidence against the MAR assumption. This error has been corrected in the online version of the paper on the JMIR website on May 16, 2016 together with publishing this correction notice. A correction notice has been sent to PubMed and PubMed Central.</p> <table-wrap position="float" id="table2"> <label>Table 2</label> <caption> <p>Comparison of groups at follow-up (total n=931 without University of Gävle).</p> </caption> <table width="100%" cellpadding="7" cellspacing="0" border="1" rules="groups" frame="hsides"> <col width="120*"/> <col width="50*"/> <col width="50*"/> <col width="37*"/> <thead> <tr valign="top"> <td>Number of follow-up emails before response, n (%)</td> <td>Intervention (n=402)</td> <td>Control (n=529)</td> <td> <italic>P</italic>-value</td> </tr> </thead> <tbody> <tr valign="bottom"> <td>1</td> <td>222 (55.2)</td> <td>315 (59.6)</td> <td>.07 <sup>a</sup></td> </tr> <tr valign="top"> <td>2</td> <td>82 (20.4)</td> <td>103 (19.5)</td> <td> <break/> </td> </tr> <tr valign="top"> <td>3</td> <td>51 (12.7)</td> <td>70 (13.2)</td> <td> <break/> </td> </tr> <tr valign="top"> <td>4</td> <td>27 (6.7)</td> <td>23 (4.3)</td> <td> <break/> </td> </tr> <tr valign="top"> <td>5</td> <td>20 (5.0)</td> <td>18 (3.4)</td> <td> <break/> </td> </tr> </tbody> </table> <table-wrap-foot> <fn id="table2fn1"> <p><sup>a</sup>Trend test.</p> </fn> </table-wrap-foot> </table-wrap> </sec> </body> <back> </back> </article>

JMIR

J Med Internet Res

Journal of Medical Internet Research

1438-8871

JMIR Publications Inc.

Toronto, Canada

v18i5e118

27183182

10.2196/jmir.5724

Corrigenda and Addenda

Correction: Online Alcohol Assessment and Feedback for Hazardous and Harmful Drinkers: Findings From the AMADEUS-2 Randomized Controlled Trial of Routine Practice in Swedish Universities

Eysenbach

Gunther

Bendtsen

Preben

PhD 1

Department of Medical and Health Sciences Linköping University

Campus US

Linköping, 581 83

Sweden 46 702324615 46 702324615 preben.bendtsen@liu.se

http://orcid.org/0000-0001-5913-2903

Bendtsen

Marcus

MSc (Med Info) 2

http://orcid.org/0000-0002-8678-1164

Karlsson

Nadine

PhD 1

http://orcid.org/0000-0003-0279-5903

White

Ian R

PhD 3

http://orcid.org/0000-0002-6718-7661

McCambridge

Jim

PhD 4

http://orcid.org/0000-0002-5461-7001

¹ Department of Medical and Health Sciences Linköping University

Linköping

Sweden ² Department of Computer Science University of Linköping

Linköping

Sweden ³ Cambridge Institute of Public Health MRC Biostatistics Unit

Cambridge

United Kingdom ⁴ Faculty of Science Department of health Sciences University of York

Heslington

United Kingdom

Corresponding Author: Preben Bendtsen preben.bendtsen@liu.se

052016

16 05 2016

18 5

e118

6 3 2016 8 3 2016

©Preben Bendtsen, Marcus Bendtsen, Nadine Karlsson, Ian R White, Jim McCambridge. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 16.05.2016.

2016

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

<p>The authors of the paper “Online Alcohol Assessment and Feedback for Hazardous and Harmful Drinkers: Findings From the AMADEUS-2 Randomized Controlled Trial of Routine Practice in Swedish Universities” (J Med Internet Res 2015;17(7):e170) used the wrong variable for the number of email reminders before participants answered the follow-up. In <xref ref-type="table" rid="table2">Table 2</xref>, the values in columns two, three, and four under the subcategory "Number of follow-up emails before response, n (%)" should read as in the table below. A footnote has also been added to the <italic>P</italic>-value associated with this variable. In the Results section, there remains no statistically significant association between the primary outcome and the number of email reminders (<italic>P</italic>=.16), consistent with the missing at random (MAR) assumption. However, analyses using the repeated attempts model and linear regression suggested an intervention effect of an 11% reduction (18% reduction to 3% reduction) and a statistically significant departure from the MAR assumption. The authors are unable to explain why this result contradicts the above analysis that uses the same variables, so they prefer to trust the simpler model and hence they do not regard the repeated attempts model findings as providing any strong evidence against the MAR assumption. This error has been corrected in the online version of the paper on the JMIR website on May 16, 2016 together with publishing this correction notice. A correction notice has been sent to PubMed and PubMed Central.</p> <table-wrap position="float" id="table2"> <label>Table 2</label> <caption> <p>Comparison of groups at follow-up (total n=931 without University of Gävle).</p> </caption> <table width="100%" cellpadding="7" cellspacing="0" border="1" rules="groups" frame="hsides"> <col width="120*"/> <col width="50*"/> <col width="50*"/> <col width="37*"/> <thead> <tr valign="top"> <td>Number of follow-up emails before response, n (%)</td> <td>Intervention (n=402)</td> <td>Control (n=529)</td> <td> <italic>P</italic>-value</td> </tr> </thead> <tbody> <tr valign="bottom"> <td>1</td> <td>222 (55.2)</td> <td>315 (59.6)</td> <td>.07 <sup>a</sup></td> </tr> <tr valign="top"> <td>2</td> <td>82 (20.4)</td> <td>103 (19.5)</td> <td> <break/> </td> </tr> <tr valign="top"> <td>3</td> <td>51 (12.7)</td> <td>70 (13.2)</td> <td> <break/> </td> </tr> <tr valign="top"> <td>4</td> <td>27 (6.7)</td> <td>23 (4.3)</td> <td> <break/> </td> </tr> <tr valign="top"> <td>5</td> <td>20 (5.0)</td> <td>18 (3.4)</td> <td> <break/> </td> </tr> </tbody> </table> <table-wrap-foot> <fn id="table2fn1"> <p><sup>a</sup>Trend test.</p> </fn> </table-wrap-foot> </table-wrap> </sec> </body> <back> </back> </article>