Table 3.

Crude and adjusted odds ratios of seasons and months of admission for survived cardiac arrest patients.

	Crude			Adjusted∗
	OR	95% CI	P-value	OR	95% CI	P-value
Season of admission
Winter (vs all other seasons)	0.85	0.76–0.94	.002	0.85	0.71–1.00	.05
Spring (vs all other seasons)	1.02	0.92–1.14	.73	1.03	0.86–1.23	.77
Summer (vs all other seasons)	1.2	1.08–1.34	.001	1.27	1.07–1.52	.008
Autumn (vs all other seasons)	0.98	0.88–1.09	.69	0.91	0.76–1.10	.34
Month of admission
January (vs all other months)	0.91	0.77–1.07	.25	1.04	0.80–1.36	.78
February (vs all other months)	0.92	0.77–1.10	.36	0.78	0.59–1.03	.08
March (vs all other months)	0.98	0.83–1.17	.85	1.15	0.89–1.50	.28
April (vs all other months)	1.08	0.91–1.27	.39	0.97	0.73–1.30	.83
May (vs all other months)	0.99	0.83 – 1.18	.90	0.95	0.72–1.26	.74
June (vs all other months)	1.27	1.08–1.50	.005	1.43	1.08–1.89	.01
July (vs. all other months)	1.15	0.97–1.36	.11	1.14	0.86–1.51	.36
August (vs. all other months)	1.07	0.90–1.27	.42	1.11	0.84–1.47	.46
September (vs. all other months)	1.02	0.86–1.23	.79	1.08	0.81–1.45	.59
October (vs. all other months)	0.91	0.77–1.09	.32	0.91	0.69–1.22	.54
November (vs. all other months)	1.01	0.86–1.19	.91	0.83	0.61–1.12	.21
December (vs. all other months)	0.80	0.68–0.95	.01	0.81	0.63–1.04	.10

^∗Adjusted for: age; sex; admission day is a weekend; factors influencing health status and contact with health services; endocrine, nutritional, and metabolic diseases and immunity disorders; diseases of the respiratory system; symptoms, signs, and ill-defined conditions; mental disorders; diseases of the genitourinary system; diseases of the nervous system and sense organs; injury diagnosis reported on records; primary expected payer; patient location: NCHS urban-rural code; median household income national quartile for patient ZIP code; region of hospital; diagnosis (Ventricular fibrillation and ventricular flutter); Procedures. (0, 1, ≥2).