There are multiple definitions:

1. sleep hygiene index(English)

   • developed from the diagnostic criteria for inadequate sleep hygiene as defined in the International Classification of Sleep Disorders, and shows adequate psychometric properties in a nonclinical sample. Other primary instruments designed to assess sleep hygiene are: the Sleep Hygiene Awareness and Practice Scale (SHAPS), the Sleep Hygiene Self-Test (SHST)
   • ICSD, SHAPS, SHST
   • Sleep medicine, Scoring systems/scales
   • https://doi.org…477-7525-11-213

2. Singapore Housing Index(English)

   • tool for health services research that can be accurately reconstructed using open datasets at no cost. This method is a convenient means for future researchers to obtain updated building-level markers of socioeconomic status for policy and research
   • SES
   • Social aspects, Financial issues
   • https://doi.org…939-021-01554-8

3. statutory health insurance(English)

   • according to a German guideline, decisions about bisphosphonate treatment for post-menopausal women should be based on 10-year fracture risk, and bone density should be measured by dual x-ray absorptiometry
   • DVO, DXA, QUS
   • Health insurance, Economics and health care
   • https://doi.org…1007/BF03256127

4. second harmonic imaging(English)

   • also denoted as SI
   • DSE, EBD, EBDI, FF, LV, SH
   • Medical imaging, Echography/ultrasound, Cardiology
   • https://doi.org…mje.2000.107635