Biostatistics

Download Analysis of Waiting-Time Data in Health Services Research by Boris Sobolev PDF

By Boris Sobolev

Why a few sufferers wait longer than others is still a tremendous query. This ebook is a reference for well-being providers researchers searching for statistical instruments with which to check ready occasions. The publication deals exact insurance of statistical innovations and techniques for the research and interpretation of waiting-time info. It presents research from overall healthiness providers examine viewpoint, instead of operations administration, and encompasses a number of examples.

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3 Analytical data set The registry records were linked to the other databases to create the analytical data set for patients registered for elective CABG. 1). In this table, the rows show variables in the data set and the columns show characteristics of each variable, such as the name, the information stored in the variable, the data sources, the type of data, and how the data are coded. For example, the variable named “SEXF” contains data on the patient’s sex and is a categorical variable where 0 indicates man and 1 indicates woman.

1 0 1 4 7 10 13 16 19 22 25 28 31 34 37 40 Time since registration (weeks) Fig. 1. Probability of undergoing elective vascular surgery within a certain waiting time, as estimated by the productlimit method the observed follow-up time. Therefore, the sample average would result in an underestimate of the mean waiting time. An alternative to the mean waiting time is the median waiting time. The median waiting time to surgery is the length of time by which half of the patients undergo surgery. Unlike the mean, the median is not biased in the presence of censored observations.

9 Statistical challenges 15 Sometimes patients registered to a specialist’s wait list are then referred to another specialist for additional investigations. If this referral results in a long delay, these patients are temporarily “put on hold” until they receive the specialist’s approval for treatment. Observations for these patients are said to be left censored since all that is known is that time to admission is actually less than the interval between registration and admission, and part of that time was spent waiting for the investigation, not for treatment.

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