Table 1

Summary of key empirical studies on factors contributing to online review helpfulness

StudiesFactors and effects on online review helpfulness
RatingRating2Review extremityReview lengthReadabilityAvailable daysReview valence/sentimentObjectivity/factualityTotal votesReview sidednessEmotionLinguistic featuresTotal review countProduct typeInformation disclosureReviewer experienceReviewer expertiseReviewer online attractiveness
Ghose and Ipeirotis (2007)   +               
Sen and Lerman (2007)       +      −    
Forman et al. (2008) + +           +   
Mudambi and Schuff (2010)  + +    −    −    
Zhang et al. (2010) ×  +              
Ghose and Ipeirotis (2011)     +  ++     +   
Pan and Zhang (2011) +  + +      −−    
Schlosser (2011)          ×        
Willemsen et al. (2011) +  +  +       +   
Wu et al. (2011) +                 
Baek et al. (2012)  +−+  + +   −−  + 
Korfiatis et al. (2012) ++ +×   −         
Yin et al. (2012)            +    + 
Scholz and Dorner (2013) +−   + ×        + 
Siering and Muntermann (2013)   −+  −++    −    
Yin et al. (2014a) −+ +−     ×       
Yin et al. (2014b)   ++−+      −   ++
Yin et al. (2014c) −  +−+−     −   ++
Zhu et al. (2014) − ++−+      −   ++
Ahmad and Laroche (2015) +  +    − ×       
Chua and Banerjee (2015) −  +            + 
Einar et al. (2015) +  +   ++    −+   
Huang et al. (2015) +  +            + 
Kuan et al. (2015)   −+  ×         + 
Liu and Park (2015) +  +          +  +
Park and Nicolau (2015)    ++         ++  
Quaschning et al. (2015) +  +            + 
Ullah et al. (2015) +− +  +           
Zhou and Guo (2015) −  + +−       ++++
Agnihotri and Bhattacharya (2016) +     +      +++  
Chen (2016)   ++     ×   +  + 
Fang et al. (2016)   ++++      −     
Hlee et al. (2016)    ++         +   
Hong et al. (2016)   −+ +×           
Lee and Choeh (2016)    +        −++ + 
Qazi et al. (2016)         −  ×      
Yin et al. (2016) − −+              
Chua and Banerjee (2017) +−         + +  + 
Gao et al. (2017)   ++ +         +  
Guo and Zhou (2017) −  + +        ++++
Karimi and Wang (2017) + −+          +   
Lee et al. (2017)    +  +   −     + 
Li et al. (2017)    ++      +    + 
Liu and Li (2017) ++ +              
März et al. (2017)   ++ ++  −−×+  +  
Wang and Karimi (2017) −  + +     −      
Wu (2017) −+++ −            
Yin et al. (2017) +  +− +   + −×    
Zhou and Guo (2017) −  +          ++++
Eslami et al. (2018) −  +       +      
Filieri et al. (2018b)          +     +  
Filieri et al. (2018c) −+ ++         + + 
Huang et al. (2018)            +      
Lu et al. (2018) +  +        +   + 
Pentina et al. (2018)       +  −        
Risselada et al. (2018)    ++ +    +    + 
Filieri et al. (2019)   ++            + 
Li et al. (2019) −  +++     +    ++
Liang et al. (2019) −+ ++         +++ 
Liu et al. (2019) −  +++     +    + 
Ren and Hong (2019) +− +      ×  −    
Shin et al. (2019)            −      
Srivastava and Kalro (2019)  + ++++       +++ 
Sun et al. (2019) −    +     +  +   
Wang and Karimi (2019) − ++ +     −      
Wang et al. (2019a) −   ++    ×+    + 
Wang et al. (2019b) ++ +++      −     
Yang et al. (2019) +  − −+       + + 
Zhou and Yang (2019) −  +++−         + 
Chatterjee (2020) +  − −−   ×     + 
Chen and Farn (2020)           +       
Craciun et al. (2020) +  +++    × −     
Fan and Zhang (2020) −  + +      −   + 
Hu (2020)            ×      
Huang et al. (2020)    + +    ××+     
Ismagilova et al. (2020)           ×  +    
Wang et al. (2020a) −    −         ++ 
Zhou et al. (2020) ++ + −−    +      
Zhu et al. (2020)   ++ −      −     

Note(s): + indicates a positive effect, − indicates a negative effect and × indicates mixed findings

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