| PDI | pain disability index; periodontal disease index; plan-do integration; psychomotor development index... |
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| RPI | regional perfusion index; relative percentage index; reticulocyte production index, ribose 5-phospha... |
| VI | Roman numeral six; vaginal irrigation; variable interval; vastus intermedius; virgo intacta; virulen... |
| CWI | cardiac work index |
| IWS | Index of Work Satisfaction |
| prevalence index | <statistics> A weighted average measure of the sum of the frequency of occurrences of all species along a single transect or as calculated for a plant community by averaging the prevalence index of all sample transects through the community. (05 Mar 1998) |
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| sacral index | A ratio obtained by multiplying the greatest breadth of the sacrum by 100 and dividing by the length. (05 Mar 2000) |
| health status index | Set of measurements designed to detect short-term fluctuations in health of members of a population; the measurements usually include physical function, emotional well-being, activities of daily living, feelings, etc. (05 Mar 2000) |
| height-length 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) |
| saturation index | An indication of the relative concentration of haemoglobin in the red blood cells, calculated as: grams of haemoglobin per 100 ml (expressed as percent of normal) ÷ haematocrit value (expressed as percent of normal) = saturation index The normal index for adults and infants is 0.97 to 1.02; in primary and secondary anaemia, the index is usually considerably less than 0.97. (05 Mar 2000) |
| Schilling's index | A method of counting blood in which the polymorphonuclear neutrophils are separated into four groups according to the number and arrangement of the nuclear masses in these cells. Synonym: Schilling's index. (05 Mar 2000) |
| heterozygosity index | Measure of the number of loci for which an individual is heterozygous. (18 Nov 1997) |
| pulsatility index | Calculation of Doppler measurements of systolic and diastolic velocities in the uterine, umbilical, or foetal circulations. (05 Mar 2000) |
| severity of illness index | Levels of severity of illness within a diagnostic group which are established by various measurement criteria. (12 Dec 1998) |
| shock index | The quotient of the cardiac rate divided by the systolic blood pressure; normally approximately 0.5, but in shock (e.g., rising pulse rate with falling blood pressure), the index may reach 1.0. (05 Mar 2000) |
| Simplified Oral Hygiene Index | An index that measures the current oral hygiene status based upon the amount of debris and calculus occurring on six representative tooth surfaces in the mouth; often used in field surveys of periodontal disease. (05 Mar 2000) |
| small increment sensitivity index | The sounding of a tone 20 dB above threshold, followed by a series of 200-msec tones 1 dB louder; perception of these is indicative of cochlear damage. Synonym: small increment sensitivity index test. (05 Mar 2000) |
| small increment sensitivity index test | The sounding of a tone 20 dB above threshold, followed by a series of 200-msec tones 1 dB louder; perception of these is indicative of cochlear damage. Synonym: small increment sensitivity index test. (05 Mar 2000) |
| spiro-index | Vital capacity divided by the height of the individual. (05 Mar 2000) |
| splenic index | A rough indication of the salubrity, or the reverse, in regard to malaria of a particular district, judged by the relative absence or prevalence of enlarged spleens among the population. (05 Mar 2000) |