OCMAP-PLUS: a program for the comprehensive analysis of occupational cohort data.

The Occupational Cohort Mortality Analysis Program (OCMAP) has been redesigned for optimal microcomputer use and extended to include new computing algorithms. The new program, OCMAP-PLUS, offers a comprehensive, flexible, and efficient analysis of incidence or mortality rates and standardized measures in relation to multiple and diverse work history and exposure measures. New features include executable code, minimization of memory requirements, disk file storage of person-day arrays, stratified analyses by geographic area, employment status and up to eight exposure variables, a data imputation algorithm for study members with unknown race, and enhanced algorithms for constructing several time-dependent exposure measures. New modules create grouped data files for Poisson and logistic regression and risk set files for use in relative risk regression analysis. The Mortality and Population Data System (MPDS) provides external comparison rates and proportional mortalities. Analysis from two recent cohort mortality studies illustrate several new features.

Charges for comprehensive obstetric care at teaching and nonteaching hospitals. A comparison.

We compared total charges for obstetric care at a major teaching hospital and faculty group practice with those at 3 nonteaching centers in western Washington. The patients were all enrollees of an employee-based health maintenance organization. Charges were used as a proxy for costs and included all outpatient, inpatient, and physician charges. In the teaching system, patients were cared for by faculty and house staff; in the nonteaching settings, they received care from private physicians. No significant differences in total charges were found between the teaching and the nonteaching settings for all deliveries ($4,652 [N = 90] versus $4,530 [N = 335], P greater than .5). In the teaching setting, vaginal deliveries were slightly more expensive ($4,178 [n = 75] versus $3,768 [n = 250], P = .15), as were cesarean deliveries ($7,024 [n = 15] versus $6,771 [n = 85], P greater than .5). The rate of cesarean deliveries was lower in the teaching setting (17% versus 25%, P = .10), partially accounting for the similarity in total charges. The length of stay was similar in the teaching hospital (3.29 versus 3.14 days, P greater than .5). We conclude that the academic medical center as a total system of care can provide obstetric care as cost-effectively as nonteaching systems under the constraints of prepaid care.