| T90 | time required for 90% mortality in a population of microorganisms exposed to a toxic agent |
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| TD | the time required to double the number of cells in a given population; thermal death time |
| UNFPA | United Nations Population Fund |
| ZPG | zero population growth |
| WBGT index | Wet Bulb Globe Thermometer index = 0.7tw + 0.3k{(tg-ta)oK + ta} ta; 건... |
| staphylo-opsonic index | The opsonic index calculated in relation to a staphylococcal infection, with a young culture of Staphylococcus aureus or the strain of staphylococcus from the patient being used in the test. (05 Mar 2000) |
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| stroke work index | A measure of the work done by the heart with each contraction, adjusted for body surface area; equal to the stroke volume of the heart multiplied by the arterial pressure and divided by body surface area; the normal stroke work index does not exceed 40 gram-meters per square meter. (05 Mar 2000) |
| suitability index curve | Graph that depicts the suitability of a physical habitat variable for a fish species or life stage, often assumed to depict the species' or life stage's relative preference for values of the variable. (09 Oct 1997) |
| nucleoplasmic index | The quotient of the nuclear volume divided by the cytoplasmic volume. (05 Mar 2000) |
| Dean's fluorosis index | An index that measures the degree of mottled enamel (fluorosis) in teeth; used most often in epidemiological field studies. (05 Mar 2000) |
| superior facial index | The length of the face is measured from the nasion to the alveolar point: (nasialveolar length × 100)/bizygomatic width; for (05 Mar 2000) |
| def caries index | An index of past caries experience based upon the number of decayed, extracted, and filled deciduous (indicated by lower case letters) or permanent (indicated by capital letters) teeth. (05 Mar 2000) |
| degenerative index | The percentage of granulocytes that contain toxic granules in the cytoplasm, as compared with the total percentage of granulocytes. (05 Mar 2000) |
| dental index | Relation of the dental length (distance from the mesial surface of the first premolar to the distal surface of the third molar) to the basinasal (basion to nasion) length: (dental length ×100)/basinasal length, a system of numbers for indicating comparative size of the teeth. Synonym: Flower's dental index. (05 Mar 2000) |
| dental plaque index | An index which scores the degree of dental plaque accumulation. (12 Dec 1998) |
| df caries index | An index of past caries experience based upon the number of decayed and filled deciduous (indicated by lower case letters) or permanent (indicated by capital letters) teeth. Synonym: df, DF. (05 Mar 2000) |
| diversity index | <ecology> The relationship of the number of taxa (richness) to the number of individuals per taxon (abundance) for a given community. (09 Oct 1997) |
| dmf index | "decayed, missing and filled teeth," a routinely used statistical concept in dentistry. (12 Dec 1998) |
| dmfs caries index | An index of past caries experience based upon the number of decayed, missing, and filled surfaces of deciduous (indicated by lower case letters) or permanent (indicated by capital letters) teeth. (05 Mar 2000) |
| icterus index | The value that indicates the relative level of bilirubin in serum or plasma; calculated by comparing (in a colourimeter) the intensity of the colour of the specimen with that of a standard solution (potassium dichromate, 0.05 g, in 500 ml of water, plus 0.2 ml of sulfuric acid); the normal range is 3 to 5, and values greater than 15 are usually associated with clinically apparent jaundice; an index less than 3 is observed in various examples of secondary anaemia, aplastic anaemia, and chlorosis. Sometimes erroneously called icteric index: it is an index of jaundice, not a jaundiced index. (05 Mar 2000) |