------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset MNREAD baseline measures in normal vision (Calabrese-et-al_2016) 2. Author Information Principal Investigator Contact Information Name: Aurelie Calabrese Institution: Aix-Marseille University, Marseille, France Address: 3 Place Victor Hugo - 13003 Marseille, France Email: acalabre@umn.edu Associate or Co-investigator Contact Information Name: Gordon E. Legge Institution: University of Minnesota Address: 75 East River Road, Minneapolis MN 55455, USA Email: legge@umn.edu 3. Date of data collection (single date, range, approximate date) 1993 - 2015 4. Geographic location of data collection (where was data collected?): Minnesota, USA 5. Information about funding sources that supported the collection of the data: This research was supported by NIH grant EY002934. --------------------- DATA & FILE OVERVIEW --------------------- 1. File List A. Filename: Calabrese-et-al_2016_full-data.csv Short description: Contains MNREAD estimates for 654 participants with normal vision (age range 8-81). The four MNREAD estimates are : Maximum Reading Speed, Reading Accessibility Index, Critical Print Size, Reading Acuity. 2. Relationship between files: N/A 3. Additional related data collected that was not included in the current data package: N/A 4. Are there multiple versions of the dataset? NO -------------------------- METHODOLOGICAL INFORMATION -------------------------- 1. Description of methods used for collection/generation of data: MNREAD data collection The MNREAD acuity chart (Precision Vision, La Salle, IL) was used to measure reading performance of the 654 participants. All of the MNREAD data were collected with a similar method, but different experimenters. 480 participants were tested at the Minnesota Laboratory for Low Vision Research in quiet, windowless lab rooms. The other 165 participants were tested at the Minnesota State Fair 2015 in a University of Minnesota multi-study dedicated-research building, where participants were tested in a curtained booth with moderate background noise level. Participants were tested binocularly at a viewing distance of 40 cm with the regular polarity version of the English chart. Additionally, some participants were also tested on the reversed polarity version of the test. Following the recommended standard procedure, participants were instructed to read the test sentences aloud as quickly and accurately as possible, beginning with the largest print size and progressing to the smallest print size that could be read. The experimenter used a stopwatch to record the reading time (in seconds, to the nearest 0.1 second) and counted the number of misread or missing words for each sentence. The testing stopped when the print size was so small that the participant could no longer read any words. Reading speed (in words per minute) was computed for each sentence read using the following formula: 60*(10–number of errors)/reading time. When participants made more than 10 errors (for sentences with more than ten words), reading speed was set to 0. 2. Methods for processing the data: MNREAD data fitting MNREAD curves of reading speed (in log(words/min)) as a function of print size (in logMAR) were fitted with an exponential-decay function using a non-linear mixed effects (NLME) model as described in Cheung et al. (2008). Variations across individuals were modeled as random effects. MNREAD parameter extraction Maximum Reading Speed (MRS; in words per minute, wpm) was estimated as the plateau of the fitted curve. Previous MNREAD studies have used log(wpm) in their analyses of reading speed. However, given that MRS was normally distributed within the sample of this study, we decided to use wpm rather than log(wpm). Critical Print Size (CPS; in logMAR) was defined as the smallest print size that yielded 90% of the MRS as derived from each individual fitted curve. Reading Acuity (RA) was calculated by adding 0.01 logMAR to the smallest tested print size for each error made in the test. Reading Accessibility Index (ACC) was calculated using the following formula: [mean (reading speed for 10 print sizes from 0.4 to 1.3 logMAR)/200] (For a detailed explanation of the ACC calculation, see Calabrèse et al. (2016)). 3. Instrument- or software-specific information needed to interpret the data: N/A 4. Standards and calibration information, if appropriate: N/A 5. Environmental/experimental conditions: N/A 6. Describe any quality-assurance procedures performed on the data: N/A 7. People involved with sample collection, processing, analysis and/or submission: N/A ----------------------------------------- DATA-SPECIFIC INFORMATION FOR: [Calabrese-et-al_2016_full-data.csv] ----------------------------------------- 1. Number of variables: 11 2. Number of cases/rows: 713 3. Missing data codes: NA 4. Variable List A. Name: id Description: subject identifier B. Name: age Description: in years C. Name: gender Description: Male vs. Female D. Name: distance_VA Description: in logMAR (Logarithm of the Minimum Angle of Resolution) E. Name: polarity Description: contrast polarity used for the MNREAD test F. Name: testing_site Description: laboratory vs. MN State Fair G. Name: tester Description: tester initials H. Name: MRS Description: Maximum Reading Speed (words/minute) I. Name: ACC Description: Reading Accessibility Index J. Name: CPS Description: Critical Print Size (logMAR) K. Name: RA Description: Reading Acuity (logMAR)