| life table | A representation of the probable years of survivorship of a defined population of subjects; since survivorship is changed by new methods of prevention or treatment, a diachronic study is commonly used because the main interest lies in the composite structure of the current population. (In the summarizing technique used to describe the pattern of mortality and survival in a population, survivors to age x are denoted by the symbol lx and the expectation of life at age x is denoted by the symbol x. (05 Mar 2000) |
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| cohort | <statistics> A cohort is a group of animals of the same species, identified by a common characteristic, which are studied over a period of time as part of a scientific or medical investigation. (09 Oct 1997) |
| cohort effect | Variation in health status arising from different causal factors to which each birth cohort in a population is exposed as environment and society change. (12 Dec 1998) |
| cohort studies | Studies in which subsets of a defined population are identified. These groups may or may not be exposed to factors hypothesised to influence the probability of the occurrence of a particular disease or other outcome. Cohorts are defined populations which, as a whole, are followed in an attempt to determine distinguishing subgroup characteristics. (12 Dec 1998) |
| cohort study | A study using epidemiological methods, such as a clinical trial, in which a cohort with a particular attribute (e.g., smokers, recipients of a drug) is followed prospectively and compared for some outcome (e.g., disease, cure) with another cohort not possessing the attribute. (05 Mar 2000) |
| Aub-DuBois table | Table of basal metabolic rates in calories per square meter of body surface per hour or day for different ages. (05 Mar 2000) |
| Gaffky table | A numerical rating for the classification of tuberculosis according to the number of tubercle bacilli in the sputum, ranging from 1 (one to four organisms in the whole preparation) to 9 (an average of 100 per field). Synonym: Gaffky scale. (05 Mar 2000) |
| vitreous table | The inner table of one of the cranial bones; it is more compact and harder than the outer table. Synonym: lamina internal ossium cranii. (05 Mar 2000) |
| water table | <ecology> The zone of saturation at the highest average depth during the wettest season, it is at least six inches thick and persists in the soil for more than a few weeks. (09 Oct 1997) |
| contingency table | A tabular cross-classification of data such that subcategories of one characteristic are indicated in rows (horizontally) and subcategories of another are indicated in columns (vertically). (05 Mar 2000) |
| cross-table lateral projection | <radiology> Lateral projection radiography of a supine subject using a horizontal X-ray beam. (05 Mar 2000) |
| inner table of skull | The inner compact layer of the cranial bones. Synonym: lamina interna cranii. (05 Mar 2000) |
| occlusal table | The occlusal or grinding surfaces of the bicuspid and molar teeth. (05 Mar 2000) |
| operating table | A table on which the patient lies during a surgical operation. (05 Mar 2000) |
| outer table of skull | The outer compact layer of the cranial bones. Synonym: lamina externa cranii. (05 Mar 2000) |