Table 3.
Outcomes | Independent variables† | Site A | Site B | Site C | |
Best-fit model | Negative binomial, Exp (β‡) | Negative binomial, Exp (β‡) | Hurdle model | ||
n=0§ | n>0 | ||||
Laboratory tests | Internality (ref: external) | 0.954* | 0.990 | 0.643 | 0.860** |
Sex (ref: female) | 1.092** | 1.021 | 0.779 | 0.983 | |
Age | 0.999 | 0.997* | 1.008 | 0.997* | |
Marriage (ref: single) | 0.992 | 1.003 | 1.189 | 0.944* | |
Race (ref: non-white) | 1.029 | 1.089 | 0.664 | 1.152* | |
Charlson comorbidity index | 1.020** | 1.011 | 0.861* | 1.014* | |
Hospitalized? (ref: no) | 1.912** | 1.236* | 0.053** | 1.373** |
Best-fit model | Negative binomial | Negative binomial | Negative binomial | |
Medications | Internality (ref: external) | 0.664** | 0.793 | 0.787* |
Sex (ref: female) | 0.943 | 0.839* | 1.038 | |
Age | 0.998 | 0.987** | 0.995* | |
Marriage (ref: single) | 1.022 | 0.957 | 0.853* | |
Race (ref: non-white) | 0.987 | 1.022 | 1.100 | |
Charlson comorbidity index | 1.038** | 0.992 | 1.029 | |
Hospitalized? (ref: no) | 2.570** | 2.155* | 5.385** |
Best-fit model | Hurdle model | Hurdle model | Hurdle model | ||||
n=0§ | n>0 | n=0§ | n>0 | n=0§ | n>0 | ||
Procedures | Internality (ref: external) | 0.874 | 0.957 | 1.354 | 0.829 | 1.015 | 0.901 |
Sex (ref: female) | 0.718 | 0.983 | 0.825 | 1.086 | 1.068 | 0.986 | |
Age | 0.996 | 1.003 | 0.988 | 1.008* | 1.001 | 1.001 | |
Marriage (ref: single) | 1.057 | 0.999 | 1.301 | 1.010 | 1.218 | 0.958 | |
Race (ref: non-white) | 0.878 | 0.957 | 1.104 | 1.122 | 0.656 | 1.104 | |
Charlson comorbidity index | 1.025 | 1.008 | 0.988 | 0.977 | 0.990 | 0.995 | |
Hospitalized? (ref: no) | 0.162** | 1.377* | 0.583 | 2.085* | 0.194** | 1.391** |
*p<0.05, **p<0.001.
ref denotes the reference group to which another group is compared to determine changes in outcome.
β: regression coefficients; Exp is the exponential function.
The odds ratio of having a count of zero.