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1. I see no reference to permission to perform these experiments from an Ethics Committee, or evidence that the volunteers signed appropriate consent forms.

2. Whereas the statistics associated with Tables 6-9 are presented, there still seems to be no statistical backing to support the statements made regarding Tables 2-5. I have already stated that advice on this will be required, and the comments, below, are based on those made regarding the first version of your paper:
"I think you need to get expert advice regarding the analysis of your data. As I understand the problem, you have several outcome measures (objective and subjective estimates of sleep). You then have several factors (shown in Table 1) and you are investigating if these influence sleep.
I think you need to get advice regarding the groups to compare (e.g. thickness of material and/or firmness and/or hysteriesis and/or spring type) rather than giving separate results for all 18 mattresses. The analysis is likely to be some form of ANOVA or regression analysis.
I note that you performed regression analyses in Section 3.2 (Tables 6-9), but you seem to have looked at the predictors separately. I wonder if some form of multiple regression analysis might be better here?"

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