Table 2.

Mean values at time-points t₀ (baseline), t₁ (1 month), t₂ (2 months), t₃ (3 months), and t₄ (6 months) of Plaque Index, Gingival Index, and White Spot Lesions for the study group and control group

	PI						GI						WSL
	Study group	SD	Control group	SD	Delta	p-value*	Study group	SD	Control group	SD	Delta	p-value*	Study group	SD	Control group	SD	Delta	p-value*
t0	0.51	0.45	0.44	0.47	− 0.07	0.383	0.88	0.52	0.43	0.43	− 0.45	0.013	1.10	1.50	1.13	2.06	0.29	0.464
t1	0.41	0.43	0.63	0.53	0.22	0.069	0.61	0.56	0.48	0.45	− 0.13	0.259	1.10	1.90	0.93	2.08	− 0.17	0.434
t2	0.42	0.42	0.69	0.54	0.27	0.050	0.45	0.45	0.58	0.48	0.13	0.281	0.73	1.02	1.00	1.90	0.27	0.372
t3	0.35	0.42	0.74	0.48	0.39	0.010	0.43	0.42	0.56	0.45	0.13	0.198	0.66	1.10	0.71	1.50	0.04	0.500
t4	0.31	0.43	0.56	0.43	0.25	0.039	0.36	0.42	0.47	0.35	0.11	0.189	0.80	1.40	0.93	1.70	0.13	0.458
p-value#	< 0.001		< 0.001				< 0.001		< 0.001				0.035		0.085

Intergroup differences at each time-point, and intra-group differences at different time-points are reported. Delta represents the value of study group minus the value of control group

PI Plaque Index; GI Gingival Index; WSL White Spot Lesions; SD Standard Deviation

Statistically significant p-values are reported in bold

^#Cochran’s Q-test; *Student’s t-test