Table 4. Logistic regression analysis of the mastery of order of draw, definition of one inversion, time to release tourniquet and time to change tubes.

Variables	Categorical Variables	β	SE	Wals	OR (95% Cl)	P
Order of draw	Age (years)	0.024	0.015	2.504	1.02 (0.99 - 1.06)	0.114
	Education level
	Associate degree or less*	-0.026	0.132	0.039	0.97 (0.75 - 1.26)	0.843
	Bachelor degree or above
	Professional title			8.950		0.011
	Staff nurses*
	Senior nurses	0.169	0.154	1.199	1.18 (0.88 - 1.60)	0.274
	Chief nurses or above	- 0.429	0.272	2.497	0.65 (0.38 - 1.11)	0.114
	Department
	Hospital wards*	0.000	0.195	0.000	1.00 (0.68 - 1.47)	1.000
	Outpatient & Emergency department
	Hospital region			322.364		< 0.001
	East region*
	Northeast region	- 2.617	0.159	270.396	0.07 (0.05 - 0.10)	< 0.001
	Central region	0.775	0.344	5.089	2.17 (1.11 - 4.26)	0.024
	West region	- 1.026	0.157	42.812	0.36 (0.26 - 0.49)	< 0.001
Definition of one inversion	Age (years)	- 0.012	0.012	1.040	0.99 (0.97 - 1.01)	0.308
	Education level
	Associate degree or less*	- 0.206	0.108	3.659	0.81 (0.66 - 1.01)	0.056
	Bachelor degree or above
Definition of one inversion	Professional title			2.819		0.244
	Staff nurses*
	Senior nurses	0.206	0.123	2.786	1.23 (0.97 - 1.56)	0.095
	Chief nurses or above	0.254	0.218	1.363	1.29 (0.84 - 1.98)	0.243
	Department
	Hospital wards*	- 0.489	0.145	11.316	0.61 (0.46 - 0.82)	0.001
	Outpatient & Emergency department
	Hospital region			38.147		< 0.001
	East region*
	Northeast region	- 0.651	0.133	24.064	0.52 (0.40 - 0.68)	< 0.001
	Central region	- 0.714	0.143	24.972	0.49 (0.37 - 0.65)	< 0.001
	West region	- 0.394	0.118	11.099	0.67 (0.54 - 0.85)	0.001
Time to release tourniquet	Age (years)	- 0.007	0.012	0.287	0.99 (0.97 - 1.02)	0.592
	Education level
	Associate degree or less*	0.153	0.115	1.781	1.17 (0.93 - 1.46)	0.182
	Bachelor degree or above
	Professional title			2.189		0.335
	Staff nurses*
	Senior nurses	- 0.061	0.135	0.205	0.94 (0.72 - 1.22)	0.651
	Chief nurses or above	- 0.314	0.229	1.888	0.73 (0.47 - 1.14)	0.169
	Department
	Hospital wards*	- 0.212	0.159	1.767	0.81 (0.59 - 1.11)	0.184
	Outpatient & Emergency department
	Hospital region			23.968		< 0.001
	East region*
	Northeast region	- 0.367	0.139	6.965	0.69 (0.53 - 0.91)	0.008
	Central region	- 0.382	0.152	6.317	0.68 (0.51 - 0.92)	0.012
	West region	0.279	0.132	4.496	1.32 (1.02 - 1.71)	0.034
Time to change tubes	Age (years)	- 0.042	0.011	13.493	0.96 (0.94 - 0.98)	< 0.001
	Education level
	Associate degree or less*	0.085	0.104	0.673	1.09 (0.89 - 1.34)	0.412
	Bachelor degree or above
	Professional title			5.431		0.066
	Staff nurses*
	Senior nurses	- 0.246	0.123	3.994	0.93 (0.61 - 1.40)	0.046
	Chief nurses or above	- 0.078	0.211	0.136	0.78 (0.61 - 1.00)	0.712
	Department
	Hospital wards*	0.072	0.153	0.222	1.08 (0.80 - 1.45)	0.638
	Outpatient & Emergency department
	Hospital region			157.368		< 0.001
	East region*
	Northeast region	- 1.416	0.124	129.659	0.24 (0.19 - 0.31)	< 0.001
	Central region	0.133	0.155	0.742	1.14 (0.84 - 1.55)	0.389
	West region	- 0.013	0.113	0.013	0.99 (0.79 - 1.23)	0.909
*Control group. β - regression coefficient. SE - Standard Error. Wals - Wald Chi square. OR - Odds Ratio. 95% Cl - 95% confidence interval. P - P-value. P < 0.05 was considered statistically significant.