From: Non-destructive collection survey of the historical Classense Library. Part I: Paper characterisation
Variable
Coef. value
Standard error
p–value
Intercept
15.77055
2.08439
8.2854E−13
DP
0.01592
0.00098
2.54946E−40
Protein (%)
2.19776
0.22617
5.03676E−19
Age
0.00685
0.00285
0.01714