Off-odor scoring scale: 1 = none, 2 = barely perceptible, 3 = perceptible, 4 = slightly strong, 5 = moderately strong, 6 = very strong and 7 = very strong.
a–d means in the same column with different superscripts are significantly different (P b 0.05).
w–z means in the same row with different superscripts are significantly different (P b 0.05).