Title: Patient-Reported Outcome Measures in Functional Dyspepsia: A Systematic Review and
COSMIN Analysis
Version: 6 Date: 04 Aug 2023
Reviewer:  Nicholas J. Talley
Reviewer's report:
The paper is improved and the authors have addressed most points.
There is one error: it is reported in the paper that the Nepean Dyspepsia Index (NDI) did NOT
establish internal consistency. This is incorrect. See for example table 4 of the initial validation
report on the NDI:  Aliment Pharmacol Ther 1999; 13: 225±235. This may change the author
conclusions in the discussion and abstract.
Table 4. Internal consistency of domains identified by factor analysis
Domain No. items                                                   Cronbach's a*                     Cronbach's a-w
Interference dailyactivities/work 13                 0.96                                              0.94
Knowledge/control  7                                                     0.90                                              0.92
Eating/drinking  3                                                               0.81                                               0.91
Sleep  2                                                                                          0.92                                             0.96
*Using unweighted responses.
 Using importance-weighted responses
Title: Patient-Reported Outcome Measures in Functional Dyspepsia: A Systematic Review and
COSMIN Analysis
Version: 6 Date: 04 Aug 2023
Reviewer:  Nicholas J. Talley
Reviewer's report:
The paper is improved and the authors have addressed most points.
There is one error: it is reported in the paper that the Nepean Dyspepsia Index (NDI) did NOT
establish internal consistency. This is incorrect. See for example table 4 of the initial validation
report on the NDI:  Aliment Pharmacol Ther 1999; 13: 225±235. This may change the author
conclusions in the discussion and abstract.
Table 4. Internal consistency of domains identified by factor analysis
Domain No. items                                                   Cronbach's a*                     Cronbach's a-w
Interference dailyactivities/work 13                 0.96                                              0.94
Knowledge/control  7                                                     0.90                                              0.92
Eating/drinking  3                                                               0.81                                               0.91
Sleep  2                                                                                          0.92                                             0.96
*Using unweighted responses.
 Using importance-weighted responses
Please review this paper.
user
Title: Patient-Reported Outcome Measures in Functional Dyspepsia: A Systematic Review and
COSMIN Analysis
Version: 6 Date: 04 Aug 2023
Reviewer:  Nicholas J. Talley
Reviewer's report:
The paper is improved and the authors have addressed most points.
There is one error: it is reported in the paper that the Nepean Dyspepsia Index (NDI) did NOT
establish internal consistency. This is incorrect. See for example table 4 of the initial validation
report on the NDI:  Aliment Pharmacol Ther 1999; 13: 225±235. This may change the author
conclusions in the discussion and abstract.
Table 4. Internal consistency of domains identified by factor analysis
Domain No. items                                                   Cronbach's a*                     Cronbach's a-w
Interference dailyactivities/work 13                 0.96                                              0.94
Knowledge/control  7                                                     0.90                                              0.92
Eating/drinking  3                                                               0.81                                               0.91
Sleep  2                                                                                          0.92                                             0.96
*Using unweighted responses.
 Using importance-weighted responses
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