. 2023 Apr 17;15:63–70. doi: 10.2147/CCIDE.S394661

Table 4.

Means (Standard Deviation) of Surface Roughness (Ra) According to Exposure Times for the Tested Groups

Treatment x Time	T0	T10	T20	T30
Tucupi	0.0994 (±0.05)^a	0.1565 (±0.08)^ab	0.1299 (±0.05)^ab	0.1625 (±0.04)^b
Cola-based soft drink	0.1959 (±0.09)^a	0.2335 (±0.06)^a	0.2545 (±0.03)^ab	0.2862 (±0.04)^b
Water	0.1933 (±0.07)^a	0.2016 (±0.03)^a	0.2107 (±0.03)^a	0.2124 (±0.02)^a

Notes: Different lowercase letters (a and b) indicate intragroup statistical difference (p ≥ 0.05) (on the same line).