Table 2.

Paired T-test (overall data).

Groups	Periodontal parameters	N	Mean	Std. deviation	Std. error mean	Mean difference	t-value	p-value
Pair 1	PI-0	60	2.52	0.50	0.07	1.42	16.348	<0.001
	PI-1	60	1.10	0.51	0.07
Pair 2	PI-1	60	1.10	0.51	0.07	0.25	3.085	0.003
	PI-2	60	0.85	0.44	0.06
Pair 3	PI-0	60	2.52	0.50	0.07	1.67	22.553	<0.001
	PI-2	60	0.85	0.44	0.06
Pair 4	GBI-0	60	2.45	0.50	0.06	1.58	16.504	<0.001
	GBI-1	60	0.87	0.54	0.07
Pair 5	GBI-1	60	0.87	0.54	0.07	0.45	6.523	<0.001
	GBI-2	60	0.42	0.53	0.07
Pair 6	GBI-0	60	2.45	0.50	0.06	2.03	19.643	<0.001
	GBI-2	60	0.42	0.53	0.07
Pair 7	PD-0	60	5.62	0.87	0.11	2.27	22.561	<0.001
	PD-1	60	3.35	0.88	0.11
Pair 8	PD-1	60	3.35	0.88	0.11	1.02	10.533	<0.001
	PD-2	60	2.33	0.57	0.07
Pair 9	PD-0	60	5.62	0.87	0.11	3.28	34.435	<0.001
	PD-2	60	2.33	0.57	0.07
Pair 10	CAL-0	60	3.52	0.95	0.12	2.15	20.315	<0.001
	CAL-1	60	1.37	0.88	0.11
Pair 11	CAL-1	60	1.37	0.88	0.11	0.98	9.892	<0.001
	CAL-2	60	0.38	0.58	0.08
Pair 12	CAL-0	60	3.52	0.95	0.12	3.13	29.139	<0.001
	CAL-2	60	0.38	0.58	0.08

There is significant change in all the four variables viz. PI, GBI, PD and CAL at all the time points with p-value less than 0.01. Bold signifies P< 0.05.

PI, plaque index; GBI, GBI, gingival bleeding index; PD, pocket depth; CAL, clinical attachment level.