Table 2: Between-groups comparison at different time intervals

Individual groups		Baseline pH (p-value)		5 minutes		10 minutes		15 minutes		30 minutes		120 minutes
1 and 2		0.353		0.218		0.005*		0.000*		0.011*		0.052
1 and 3		0.971		0.089		0.631		0.579		0.315		0.280
1 and 4		0.218		0.052		0.684		0.043*		0.631		0.436
2 and 3		0.353		0.015*		0.001*		0.000*		0.003*		0.004*
2 and 4		0.579		0.002*		0.009*		0.143		0.023*		0.353
3 and 4		0.218		0.579		0.436		0.052		0.280		0.075

*Statistically significant values obtained using Mann-Whitney test