Table S3.12: Predicting the prevalence of categories related to 'helpfulness'. The sample is limited to reviews longer than 200 words. Table shows coefficients from mixed effects linear regression models. Standard errors in parentheses.

	Suggestion and Solution	Example	Criticism	Praise
(Intercept)	35.92 (0.77)***	14.12 (0.82)***	15.77 (0.56)***	9.21 (0.41)***
JIF group: 2 (ref.: JIF group: 1)	-0.34 (1.06)	1.65 (1.12)	1.52 (0.76)*	0.00 (0.56)
JIF group: 3	-0.74 (1.11)	1.38 (1.20)	1.50 (0.78)	-0.07 (0.58)
JIF group: 4	-0.75 (1.10)	1.50 (1.19)	2.16 (0.77)**	-1.10 (0.57)
JIF group: 5	-0.86 (1.05)	1.51 (1.14)	0.79 (0.75)	0.08 (0.55)
JIF group: 6	-1.47 (1.07)	2.26 (1.17)	0.73 (0.76)	-0.48 (0.55)
JIF group: 7	-1.93 (1.05)	1.65 (1.15)	1.57 (0.74)*	-0.44 (0.54)
JIF group: 8	-2.15 (1.07)*	0.53 (1.18)	0.55 (0.75)	-0.04 (0.55)
JIF group: 9	-3.92 (1.10)***	2.22 (1.23)	3.17 (0.76)***	0.03 (0.56)
JIF group: 10	-5.34 (1.08)***	0.79 (1.18)	1.77 (0.75)*	0.02 (0.55)
AIC	53136.08	52622.08	49422.42	45443.43
BIC	53224.00	52710.00	49510.34	45531.34
Log Likelihood	-26555.04	-26298.04	-24698.21	-22708.71
N	6392	6392	6392	6392
N groups: Reviewer ID	6048	6048	6048	6048
N groups: Journal ID	1449	1449	1449	1449
***p < 0.001; **p < 0.01; *p < 0.05