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Table 6 Correlation coefficients between rating systems available in app stores and MARS star rating, total and subjective quality scores, by number of ratings cut-off and rater

From: Development and validation of the Italian version of the Mobile Application Rating Scale and its generalisability to apps targeting primary prevention

MARS item/scale N of apps (%) N of ratings cut-off Rater 1 Rater 2
Estimate p Estimate p
MARS star rating (N23)a 37 (86.0) 1 .18 .28 .26 .12
31 (72.1) 5 .25 .17 .31 .086
23 (53.5) 10 .50 .015 .46 .028
MARS total scoreb 37 (86.0) 1 .02 .92 .09 .62
31 (72.1) 5 .03 .89 .09 .62
23 (53.5) 10 .43 .041 .37 .081
App subjective qualityb 37 (86.0) 1 .16 .35 .20 .23
31 (72.1) 5 .19 .30 .26 .16
23 (53.5) 10 .50 .015 .54 .008
  1. a Spearman’s ρ correlation coefficient; b Pearson’s r correlation coefficient