| PEI | Patient Exit Interview; phosphate excretion index; physical efficiency index; polyethyleneimine |
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| PRI | Pain Rating Index; phosphate reabsorption index; phosphoribose isomerase; placental ribonuclease inh... |
| PSI | posterior sagittal index; problem solving information; prostaglandin synthetic inhibitor; psychologi... |
| RRI | recurrent respiratory infection; reflex relaxation index; relative response index |
| SFI | Sexual Function Index; Social Function Index |
| thoracic index | Anteroposterior diameter of the thorax times 100 divided by the transverse diameter of the thorax. Synonym: chest index. (05 Mar 2000) |
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| tibiofemoral index | The ratio obtained by multiplying the length of the tibia by 100 and dividing by the length of the femur. (05 Mar 2000) |
| effective temperature index | A composite index of environmental comfort which is compared after exposure to different combinations of air temperature, humidity, and movement. (05 Mar 2000) |
| total facial index | Length is measured from the nasion to the mental tubercle: (nasimental length × 100)/bizygomatic width. (05 Mar 2000) |
| empathic index | The degree of emotional understanding or empathy experienced by a health services provider or other person concerning another person, more particularly of a sufferer from some emotional or somatic condition. (05 Mar 2000) |
| endemic index | The percentage of children infected with malaria or other endemic disease, in any given locality. (05 Mar 2000) |
| transversovertical index | The relation of the height to the length of the skull: (height × 100)/length. Synonym: height-length index, length-height index, transversovertical index. (05 Mar 2000) |
| tuberculo-opsonic index | The opsonic index calculated in relation to tuberculous infection, with an actively growing culture of Mycobacterium tuberculosis or the strain of tubercle bacillus from the patient being used in the test. (05 Mar 2000) |
| facial index | Relation of the length of the face to its maximal width between the zygomatic prominences; to get (05 Mar 2000) |
| karyopyknotic index | An index used to monitor the hormonal status of the patient as reflected by exfoliated vaginal cells and their morphology; an expression of the percentage of intermediate and superficial cells from squamous cells of vaginal epithelium which have pyknotic nuclei. (05 Mar 2000) |
| zygomaticoauricular index | The ratio between the zygomatic and the auricular diameters of the skull or head. (05 Mar 2000) |
| uricolytic index | <biochemistry> The percentage of uric acid oxidised to allantoin before being secreted. (05 Mar 2000) |
| Flower's 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) |
| freedle index | An index of the quality of spawning gravel obtained by dividing geometric mean diameter of particle size by the sorting coefficient. (09 Oct 1997) |
| free thyroxine index | An arbitrary value obtained by multiplying the triiodothyronine uptake by the serum thyroxine concentration; it largely corrects for variations in thyroid-bound globulin concentration by providing a clinically valid estimate of the physiologically active free thyroxine; direct assay or laboratory measurement of free serum thyroxine yields a more accurate value. (05 Mar 2000) |