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

Table 3.

Mean (Standard Deviation) of Knoop Microhardness as a Function of Exposure Times for the Tested Groups

Treatment x Time	T0	T10	T20	T30
Tucupi	283.39 (±78.17)^a	213.08 (±53.69)^a	152.88 (±70.22)^b	109.67 (±36.44)^c
Cola-based soft drink	208.16 (±106.81)^a	155 (±41.18)^ab	117.53 (±36.28)^b	124.94 (±48.20)^ab
Water	308.14 (±73.66)^a	242.37 (±35.57)^b	258.17 (±61.31)^ab	261.01 (±38.88)^ab

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