Table 3.

Pre- and Post-intervention mean knowledge scores of students in the seminar and school cohorts by class and age.

Variable	Seminar cohort						School cohort
	n	Pre		Post		p value	n	Pre		n	Post		p value
		MKS	SD	MKS	SD			MKS	SD		MKS	SD
Overall	124	12.94	9.23	60.39	9.75	< 0.0001	1319	12.07	9.74	1201	53.74	10.69	< 0.0001
Class
JSS1	5	13.6	14.03	55.00	8.25	< 0.0012	297	11.57	10.00	37	53.08	11.76	< 0.0001
JSS2	19	17.68	11.65	59.16	9.00	< 0.0001	151	12.05	9.06	196	53.88	10.44	< 0.0001
JSS3	41	10.54	8.89	60.57	10.21	< 0.0001	425	12.15	9.53	483	53.28	10.84	< 0.0001
SS1	26	12.62	8.66	59.54	10.51	< 0.0001	176	11.70	9.66	165	55.59	10.63	< 0.0001
SS2	18	12.0	7.88	61.56	8.36	< 0.0001	135	12.41	10.91	174	53.15	10.44	< 0.0001
SS3	15	14.93	7.32	63.14	10.43	< 0.0001	109	13.10	10.24	111	53.37	10.90	< 0.0001
Age
9	1	12.00	–	60.00	–	< 0.0001	2	4.00	5.66	3	56.00	14.42	< 0.0001
10	3	6.67	11.55	52.00	6.93	< 0.0001	125	10.85	8.89	49	55.67	10.03	< 0.0001
11	5	14.40	8.76	58.40	10.04	< 0.0001	129	12.99	11.08	75	53.92	10.69	< 0.0001
12	21	15.62	9.79	59.24	9.35	< 0.0001	299	11.49	9.05	216	52.95	10.34	< 0.0001
13	34	12.24	11.40	60.24	10.65	< 0.0001	319	12.29	9.82	378	53.59	10.95	< 0.0001
14	15	12.80	6.45	56.53	8.80	< 0.0001	134	11.49	9.45	157	53.10	10.81	< 0.0001
15	22	10.91	8.66	62.18	9.70	< 0.0001	144	12.86	10.82	173	54.26	10.21	< 0.0001
16	19	13.89	7.47	63.33	8.92	< 0.0001	141	12.82	10.13	106	55.25	11.13	< 0.0001
17	4	12.94	9.27	68.00	9.24	< 0.0001	26	11.85	9.01	34	52.59	11.41	< 0.0001

MKS – Mean knowledge Score, SD – standard deviation, JSS – Junior secondary school, SS – Senior Secondary.