Table 3: Mean pH values in different groups at different time intervals

		Baseline				After exposure				5 min				10 min				15 min				30 min
Time interval		Mean		SD		Mean		SD		Mean		SD		Mean		SD		Mean		SD		Mean		SD
Group I		7.15		0.15		7.50		0.18		7.29		0.18		7.21		0.18		7.19		0.17		7.17		0.18
Group II		7.28		0.17		6.33		0.30		6.92		0.16		7.14		0.16		7.22		0.15		7.29		0.18
Group III		7.20		0.22		6.29		0.37		6.75		0.29		6.58		0.29		6.92		0.22		7.08		0.20
Group IV		7.26		0.14		7.57		0.10		7.49		0.09		7.25		0.06		7.22		0.06		7.21		0.06
Group V		7.24		0.17		7.63		0.20		7.41		0.16		7.25		0.14		7.18		0.12		7.13		0.13
Total		7.23		0.18		7.06		0.66		7.17		0.34		7.09		0.31		7.15		0.19		7.18		0.17
ANOVA “F” value		4.610				374.802				136.350				119.080				32.532				12.505
p-value		0.001 (HS)				0.001 (HS)				0.001 (HS)				0.001 (HS)				0.001 (HS)				0.001 (HS)

SD: Standard deviation; HS: Highly significant