TABLE IV
Regression Discontinuity Models for Changes in Treatment Intensity
| Length of stay (days) | Number of procedures | Log list charges (×100) | ||||
|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | |
| Age over 65 | 0.37 (0.24) | 0.35 (0.26) | 0.09 (0.03) | 0.11 (0.03) | 2.5 (1.1) | 2.6 (1.0) |
| Additional controls | No | Yes | No | Yes | No | Yes |
| Mean of dependent variable for patients aged 63 or 64 | 8.12 | 2.50 | 9.87 | |||
Notes. Standard errors in parentheses. Dependent variable is length of stay in days (columns (1) and (2)), number of procedures performed (columns (3) and (4)), and log of total list charges (columns (5) and (6)). Sample includes 407,386 (352,652 in columns (5) and (6)) observations on patients with valid SSNs between the ages of 60 and 70 admitted to California hospitals between January 1, 1992, and November 30, 2002 for an unplanned admission through the ED. Data on list charges are missing for Kaiser hospitals. See note to Table III for additional details on sample, and list of additional covariates included in even-numbered columns. In columns (5) and (6) the coefficient on “age over 65” and its standard error have been multiplied by 100.