. 2018 Mar 9;19:23. doi: 10.1186/s12910-018-0264-7

Table 5.

The difference of knowledge scores compared between control and intervention subgroups

Analysis variable	Control			Intervention			p-value	p-value for interaction of experimental group and analysis variable
	n	Mean	Standard deviation	n	Mean	Standard deviation
Age (years)
< 36	32	9.38	11.34	39	21.80	17.30	< 0.001^a	0.046
≥ 36	40	12.00	11.14	31	14.84	15.46	0.392^a
Sex
Female	29	9.31	8.84	34	15.00	15.42	0.084^a	0.329
Male	43	11.86	12.58	36	22.22	17.42	0.003^a
Education
< High school	13	9.23	11.15	8	20.00	15.12	0.073^a	0.624
≥ High school	59	11.19	11.31	62	18.55	17.07	0.004^a
Injury severity score
≦4	55	11.82	11.56	57	20.35	17.11	0.003^a	0.427
> 4	17	7.65	9.70	13	11.54	13.45	0.388^a
Transferred
Yes	16	6.25	9.57	19	16.84	14.55	0.015^a	0.550
No	56	12.14	11.40	51	19.41	17.60	0.014^a
Arrival time
8–16 h	30	12.00	12.70	36	20.56	18.66	0.031^a	0.711
Others	42	10.00	10.12	34	16.76	14.51	0.025^a
Physician
Physician A	18	8.33	7.86	16	17.50	17.32	0.066^a	0.970
Physician B	7	11.43	9.00	10	17.00	22.63	0.495^a
Physician C	14	10.00	10.38	6	16.67	22.51	0.514^a
Physician D	11	14.55	15.08	12	18.33	17.49	0.583^a
Physician E	9	15.56	17.40	14	22.14	14.24	0.358^a
Physician F	13	8.46	8.01	12	19.17	11.65	0.015^a

^aUnequal variance test