Outcomes of prolonged mechanic ventilation: a discrimination model based on longitudinal health insurance and death certificate data

Lu, Hsin-Ming; Chen, Likwang; Wang, Jung-Der; Hung, Mei-Chuan; Lin, Ming-Shian; Yan, Yuan-Horng; Chen, Cheng-Ren; Fan, Po-Sheng; Huang, Lynn Chu; Kuo, Ken N

doi:10.1186/1472-6963-12-100

Table 2 Adjusted odds ratios for selected predictors of post-PMV survival and sample characteristics*

From: Outcomes of prolonged mechanic ventilation: a discrimination model based on longitudinal health insurance and death certificate data

	3-month survival		6-month survival		1-year survival		2-year survival		% patients with the feature
Predictor^‡	OR^†	95% CI	OR^†	95% CI	OR^†	95% CI	OR^†	95% CI
Diagnoses at PMV onset (excluding respiratory failure)
Neoplasms	0.30**	0.27-0.34	0.31**	0.27-0.36	0.30**	0.26-0.35	0.31**	0.26-0.38	13.6
Acute and unspecified renal failure	0.39**	0.34-0.45	0.40**	0.35-0.47	0.48**	0.41-0.57	0.56**	0.47-0.67	7.7
Shock	0.42**	0.38-0.47	0.47**	0.42-0.53	0.55**	0.48-0.62	0.63**	0.55-0.73	11.2
Chronic renal failure	0.44**	0.37-0.51	0.43**	0.36-0.52	0.41**	0.33-0.50	0.43**	0.34-0.54	6.3
Septicemia	0.52**	0.48-0.57	0.56**	0.51-0.61	0.60**	0.54-0.66	0.63**	0.56-0.70	20.3
Non-alcoholic liver disease	0.60**	0.51-0.71	0.67**	0.56-0.81	0.72**	0.60-0.88	0.84	0.69-1.03	4.5
Heart failure	0.77**	0.68-0.87	0.76**	0.67-0.86	0.79**	0.69-0.91	0.77**	0.66-0.90	9.1
Diabetes mellitus	0.78**	0.71-0.85	0.77**	0.70-0.85	0.72**	0.65-0.79	0.73**	0.65-0.81	21.0
Disease history (number of admissions for the disease in the previous year; excluding respiratory failure)
Other diseases of the blood and blood-forming organs	0.85**	0.80-0.91	0.83**	0.77-0.90	0.78**	0.72-0.86	0.80**	0.73-0.89	12.6
Non-alcoholic liver disease	0.86**	0.80-0.93	0.86**	0.79-0.94	0.89*	0.81-0.98	0.92	0.83-1.01	6.8
Neoplasms	0.91**	0.88-0.95	0.89**	0.84-0.93	0.88**	0.83-0.93	0.89**	0.84-0.94	14.4
Chronic renal failure	0.91**	0.85-0.97	0.88**	0.81-0.95	0.83**	0.75-0.92	0.78**	0.69-0.89	6.9
Gender (ref: female)
Male	0.89**	0.83-0.95	0.84**	0.78-0.90	0.79**	0.74-0.85	0.78**	0.72-0.84	60.1
Age group (ref: 17-34)
35-44	0.67**	0.51-0.87	0.64**	0.49-0.83	0.61**	0.47-0.79	0.65**	0.51-0.84	3.3
45-54	0.67**	0.52-0.85	0.60**	0.48-0.76	0.54**	0.43-0.69	0.55**	0.44-0.70	6.2
55-64	0.62**	0.49-0.78	0.52**	0.41-0.65	0.43**	0.35-0.54	0.39**	0.32-0.49	11.2
65-74	0.44**	0.36-0.55	0.36**	0.29-0.44	0.28**	0.23-0.35	0.25**	0.20-0.31	26.7
75-84	0.36**	0.29-0.44	0.27**	0.21-0.33	0.19**	0.15-0.23	0.16**	0.13-0.20	35.2
≥ 85	0.29**	0.23-0.36	0.21**	0.17-0.26	0.15**	0.12-0.19	0.11**	0.09-0.14	14.7
Number of patients		19,127*		19,127*		19,127*		19,127*	25,482*
Model significance (results from log-likelihood ratio tests)	χ²(103) = 3,099.81**		χ²(103) = 3,032.36**		χ²(103) = 2,939.46**		χ²(103) = 2,652.06**

PMV prolonged MV
OR odds-ratio.
CI confidence interval.
* p < 0.05; ** p < 0.01.
* The sample for survival model estimation includes patients from 1998 to 2002, and the sample for describing patient characteristics includes patients from 1998 to 2003.
^† The OR was adjusted for all other covariates. Covariates in the model included hospital characteristics at the episode onset (hospital type, hospital location), and individual demographics (gender, age, NHI registration location), year of incidence, socioeconomic conditions (salary class in NHI registration), diseases reported at the episode onset (except respiratory failure), and diseases causing hospital care use within the year before the episode (except respiratory failure).
^‡ The table only shows OR figures for selected explanatory variables; OR figures for all explanatory variables are shown in a supplementary file (Additional file 2).

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ISSN: 1472-6963

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