Table A1.

Analysis of significance for data shown in Figure 4a–b. Because normality could not be proven for all individual data sets (Shapiro–Wilk test), the Mann–Whitney rank sum U-test was applied to all data pairs with respect to comparability. High significance level (p < 0.01) is highlighted in green, weak significance level (0.01 < p < 0.1) is highlighted in yellow, not significant data pairs (p > 0.1) are marked red.

Water Amount: Mann Whitney u-Test
p-Values		A1	A2	A3	A4	B1	B2	B3	B4	PEG-DA
A1	n = 5	1.00	0.01	0.01	0.01	0.01	0.01	0.01	0.01	0.06
A2	n = 5		1.00	0.01	0.01	0.01	0.01	0.01	0.01	0.42
A3	n = 5			1.00	0.01	0.01	0.01	0.01	0.01	0.01
A4	n = 5				1.00	0.01	0.01	0.01	0.01	0.01
B1	n = 5					1.00	0.01	0.01	0.01	0.01
B2	n = 5						1.00	0.01	0.01	0.01
B3	n = 5							1.00	0.01	0.01
B4	n = 5								1.00	0.01
PEG-DA	n = 5									1.00
Sample Height Change: Mann Whitney u-Test
p-values		A1	A2	A3	A4	B1	B2	B3	B4	PEG-DA
A1	n = 5	1.00	0.31	0.01	0.01	0.22	0.10	0.01	0.01	0.22
A2	n = 5		1.00	0.01	0.01	0.15	0.03	0.01	0.01	0.06
A3	n = 5			1.00	0.01	0.10	0.01	0.01	0.31	0.15
A4	n = 5				1.00	0.01	0.01	0.01	0.01	0.01
B1	n = 5					1.00	0.55	0.01	0.10	0.69
B2	n = 5						1.00	0.01	0.02	1.00
B3	n = 5							1.00	0.01	0.02
B4	n = 5								1.00	0.15
PEG-DA	n = 5									1.00
Sample Diameter Change: Mann Whitney u-Test
p-values		A1	A2	A3	A4	B1	B2	B3	B4	PEG-DA
A1	n = 5	1.00	0.42	0.01	0.01	0.02	0.01	0.01	0.01	1.00
A2	n = 5		1.00	0.01	0.01	0.02	0.01	0.01	0.01	0.15
A3	n = 5			1.00	0.01	0.01	0.01	0.15	0.06	0.01
A4	n = 5				1.00	0.01	0.01	0.01	0.01	0.01
B1	n = 5					1.00	0.01	0.01	0.01	0.01
B2	n = 5						1.00	0.01	0.06	0.01
B3	n = 5							1.00	0.01	0.01
B4	n = 5								1.00	0.01
PEG-DA	n = 5									1.00