Table 5:

Regression results; detailed descriptions of predictors are in the Appendix.

	Coef	P> |t|	[0.025	0.975]
Intercept	1.94	0.00	1.91	1.97
Length of Summary	0.35	0.00	0.34	0.36
BART	1.79	0.00	1.77	1.82
T5	−0.11	0.00	−0.13	−0.09
Pegasus	−0.02	0.07	−0.05	0.00
Train SP	1.43	0.00	1.40	1.46
Train RCT	2.28	0.00	2.25	2.31
Train Reddit	−0.37	0.00	−0.40	−0.34
Train XSum	0.24	0.00	0.20	0.27
Test SP	0.55	0.00	0.52	0.59
Test RCT	−0.95	0.00	−1.06	−0.84
Test Reddit	−0.52	0.00	−0.55	−0.49
Test XSum	−0.37	0.00	−0.40	−0.34
RCT - SP	2.90	0.00	2.85	2.95
RCT - RCT	2.41	0.00	2.25	2.56
RCT - Reddit	0.40	0.00	0.36	0.44
RCT - XSum	−0.07	0.00	−0.11	−0.03
Reddit - SP	0.60	0.00	0.54	0.65
Reddit - RCT	0.40	0.00	0.24	0.56
Reddit - Reddit	−0.71	0.00	−0.75	−0.67
Reddit - XSum	0.33	0.00	0.29	0.38
SP - SP	0.51	0.00	0.45	0.56
SP - RCT	−0.45	0.00	−0.61	−0.29
SP - Reddit	0.49	0.00	0.45	0.53
SP - XSum	0.15	0.00	0.11	0.20
XSum - SP	0.66	0.00	0.61	0.71
XSum - RCT	0.81	0.00	0.65	0.97
XSum - Reddit	0.44	0.00	0.40	0.48
XSum - XSum	0.11	0.00	0.07	0.16