Table 2.
Tests for Interaction of Case-Mix Variables with Service
| Nurse Rating | Doctor Rating | Hospital Rating | |||||
|---|---|---|---|---|---|---|---|
| Predictor | Level of Service | Estimate | Overall p-Value | Estimate | Overall p-Value | Estimate | Overall p-Value |
| Service main | Medical | 0.259 | .3989 | −0.66* | .0015 | 0.08 | .8922 |
| Effect | OB | −0.06 | −0.65* | 0.01 | |||
| Age | Medical | −0.06* | .0081 | 0.08*** | .0004 | 0.00 | .1409 |
| OB | −0.02 | 0.05 | −0.09 | ||||
| GHS | Medical | −0.04 | .5152 | −0.07 | .1506 | −0.08 | .1301 |
| OB | 0.01 | −0.07 | −0.01 | ||||
| MHS | Medical | 0.00 | .8607 | 0.02 | .0218 | −0.01 | .2475 |
| OB | 0.03 | 0.14* | 0.08 | ||||
| Education | Medical | 0.08* | .0035 | −0.03 | .4416 | 0.03 | .1697 |
| OB | 0.09* | 0.01 | 0.06 | ||||
| Male | Medical | −0.10 | .1432 | 0.08 | .4737 | −0.06 | .5185 |
| OB | −0.84 | −0.07 | −0.43 | ||||
| Non-Hispanic black | Medical | −0.13 | .2218 | 0.28 | .0353 | 0.09 | .0033 |
| OB | −0.24 | 0.05 | −0.35* | ||||
| Spanish language | Medical | −0.12 | .0510 | 0.14 | .1221 | 0.05 | .1604 |
| OB | 0.30 | 0.34 | 0.30 | ||||
| Proxy help | Medical | 0.03 | .8431 | −0.10 | .0762 | −0.03 | .9349 |
| OB | 0.12 | −0.46 | −0.06 | ||||
The ordinal predictors were represented as linear scale variables when testing for the above interaction effects. Surgery was the baseline category for the main and the interaction effects. Boldface values indicate interactions that have p <.005, while *p <0.1, **p <.001, and ***p <.0001 denote the p-values of individual contrasts.
OB, obstetrics; GHS, general health status; MHS, mental health status.