Relationship Between Nonconveyed Cases and On-Scene Time Intervals for Emergency Medical Services

Figures & data

Figure 1 Nonconveyed cases included in the study.

Table 1 Center vs Categories of Nonconveyed Cases

Center	Nonconveyed Cases						Total	%
	Treatment Given on Scene, V1	Refused by Patient/Relative, V2	Patient Not Found, V3	Dead Patient, V4	Other (Police, etc), V5	NA (Not Available), V6
1	3	111	2	6	3	4	129	10.57
12	4	86	5	3	8	15	121	9.91
16	11	102	9	6	2	5	135	11
19	1	63	0	1	2	2	69	5.65
21	4	68	7	4	2	6	91	7.45
22	15	146	13	26	1	31	232	19
24	23	131	11	14	7	3	189	15.5
26	1	47	3	1	0	5	57	4.67
3	2	48	6	8	2	2	69	5.65
6	2	74	11	11	7	23	128	10.49
Total	66	876	67	80	34	96	1,220	100
Mean	6.6	87.6	6.7	8
SD	7.38	34.06	4.296	7.57

Figure 2 Station vs category for nonconveyed cases.

Table 2 Centers vs On-Scene Time Intervals

Center	On-Scene Time Interval					Total	%
	1–10, V1	11–20, V2	21–30, V3	>30, V4	NA (Not Available), V5
1	19	53	27	6	24	129	10.57
12	14	23	11	6	67	121	9.91
16	11	22	7	11	84	135	11
19	8	22	4	3	32	69	5.65
21	17	23	12	6	33	91	7.45
22	27	56	19	19	111	232	19
24	29	64	21	7	68	189	15.5
26	12	15	5	5	20	57	4.67
3	6	16	4	4	39	69	5.65
6	11	29	17	10	61	128	10.49
Total	145	323	127	76	539	1,220	100
Mean	15.4	32.3	12.7	7.6
Std. Deviation	7.677	18.12	8.01	4.765

Figure 3 EMS center vs on-scene time interval of nonconveyed cases.

Table 3 Final Logistic Regression Model of Categories Associated with Nonconveyed Cases

	OR	95% CI (OR)	β^a	SE (β)	p-value
Treatment given on scene	1 (reference)
Refused by patient/relative	44.608	33.792–58.886	3.797	0.141	***p<0.001
Patient not found	1.016	0.716–1.441	0.015	0.178
Dead patient	1.226	0.876–1.716	0.204	0.171
Other (police, etc)	0.501	0.329–0.764	−0.690	0.215	**p<0.01
NA (not available)	1.493	1.080–2.065	0.401	0.165	*p<0.05

Notes: ^aRegression coefficient; *p<0.05; **p<0.01; ***p<0.001.

Table 4 Distribution of Categories of Nonconveyed Cases Among Centers

Center	χ^2	P-value	V1	V2	V3	V4	V5	V6
1	3	111	2	6	3	4	447.51	0.001
12	4	86	5	3	8	15	262.55
16	11	102	9	6	2	5	339.26
19	1	63	0	1	2	2	219.33
21	4	68	7	4	2	6	221.85
22	15	146	13	26	1	31	371.82
24	23	131	11	14	7	3	384.49
26	1	47	3	1	0	5	139.92
3	2	48	6	8	2	2	145.17
6	2	74	11	11	7	23	167.31
χ^2	74.30	119.20	15.61	64.50	15.76	95.04
p-value	0.001

Table 5 Distribution of Categories of On-Scene Time Interval Among Centers

Center	1–10, V1	11–20, V2	21–30, V3	>30, V4	NA, V5	χ^2-Value	p-value
1	19	53	27	6	24	45.84	0.001
12	14	23	11	6	67	100.94
16	11	22	7	11	84	155.03
19	8	22	4	3	32	46.72
21	17	23	12	6	33	23.67
22	27	56	19	19	111	132.39
24	29	64	21	7	68	76.89
26	12	15	5	5	20	14.84
3	6	16	4	3	39	67.14
6	11	29	17	10	61	70.12
χ^2	34.44	91.52	45.51	26.89	144.13
p-value	0.001

Table 6 Correlation Coefficients Among Categories of Nonconveyed Cases

	V1	V2	V3	V4	V5	V6
V1	1	0.815**	0.686*	0.667*	0.226	0.162
V2		1	0.576	0.748*	0.213	0.427
V3			1	0.809**	0.266	0.623*
V4				1	0.046	0.698*
V5					1	0.189
NA						1

Notes: *p<0.05; **p<0.01.

Table 7 Correlation Coefficients Among Categories of On-Scene Time Interval

	1–10, V1	11–20, V2	21–30, V3	>30, V4	NA (Not Available)
1–10, V1	1	0.899**	0.753**	0.542	0.467
11–20, V2		1	0.871**	0.478	0.412
21–30, V3			1	0.403	0.227
>30, V4				1	0.856**
NA					1

Note: **p<0.01.

Table 8 Polynomial Regression Analysis o Number of Cases and On-Scene Time–Interval Categories

Variables	Estimate	SE	F-value	p-value	R^2
	437.20	426.73	0.83	0.5462	45.38
x	−252.32	325.20
x^2	51.07	53.17