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. Author manuscript; available in PMC: 2012 Jun 1.
Published in final edited form as: Crit Care Med. 2011 Jun;39(6):1257–1262. doi: 10.1097/CCM.0b013e31820ee1df

Table 4.

Parameter Estimates from Multivariable Generalized Linear Model for Total Cost on APACHE III Q4 Night Patients Stratum

Variable Coefficient SE Degrees of Freedom Chi-square p-value
Intercept 11.466 0.302 1 1439.8 <.001
Staffing change status -0.610 0.246 1 6.1 0.013
November -0.339 0.182 1 3.5 0.063
December -0.467 0.194 1 5.8 0.016
Age -0.010 0.003 1 7.6 0.006
Female -0.149 0.087 1 3.0 0.086
Internal_admit 0.096 0.101 1 0.9 0.345
External_admit 0.240 0.133 1 3.2 0.072
Time Trend 0.026 0.018 1 2.0 0.163
Other factors1 19 56.3 <0.001

SE – standard error

Note:

1

Other factors include ICU admission diagnosis (e.g. cardiac arrest, GI bleed, respiratory arrest, sepsis etc.).

2
Variable definitions
  1. November, December: indicators for ICU admissions in these months
  2. Female: 1 if patient is female, 0 male
  3. Internal_admit, External_admit: value 1 if patient was admitted to the ICU from the hospital floor (internal) or other hospital (external), otherwise 0