Table S3.10: Predicting the prevalence of categories related to 'helpfulness'. The sample is limited to reviews consisting of at least 10 sentences. Table shows coefficients from negative binomial regression models. Standard errors in parentheses.

	Suggestion and Solution	Example	Criticism	Praise
(Intercept)	8.18 (0.38)***	3.58 (0.34)***	3.62 (0.22)***	1.88 (0.10)***
JIF group: 2 (ref.: JIF group: 1)	0.91 (0.52)	0.86 (0.47)	0.66 (0.30)*	0.09 (0.14)
JIF group: 3	0.13 (0.55)	0.43 (0.50)	0.43 (0.31)	0.09 (0.15)
JIF group: 4	0.88 (0.55)	0.87 (0.50)	1.02 (0.32)**	-0.10 (0.15)
JIF group: 5	1.03 (0.53)	1.26 (0.48)**	0.84 (0.30)**	0.09 (0.14)
JIF group: 6	0.37 (0.54)	1.11 (0.49)*	0.46 (0.31)	-0.01 (0.14)
JIF group: 7	1.06 (0.53)*	1.00 (0.48)*	1.03 (0.30)***	0.17 (0.14)
JIF group: 8	0.60 (0.54)	0.72 (0.49)	0.79 (0.31)*	0.19 (0.15)
JIF group: 9	0.30 (0.56)	1.19 (0.51)*	1.45 (0.32)***	0.15 (0.15)
JIF group: 10	0.46 (0.55)	1.14 (0.50)*	1.48 (0.31)***	0.41 (0.15)**
AIC	44312.27	42799.77	37043.51	26199.62
Log Likelihood	-22143.13	-21386.88	-18508.76	-13086.81
N	6510	6510	6510	6510
N groups: Journal ID	1457	1457	1457	1457
N groups: Reviewer ID	6157	6157	6157	6157
***p < 0.001; **p < 0.01; *p < 0.05