Software

Frequently Asked Questions

Below are answers to frequently asked questions. If you can’t find the answer you're looking for please contact us here.

Electronic Data Capture (EDC)

  • What are the desktop/laptop requirements for iDataFax and the other user tools?

    All user tools are available for Windows 7/8/10, OS X v10.8+, Linux and Solaris, and require approximately 60 MB to install.

  • What size computer monitor works best with iDataFax?

    A minimum screen resolution of 1280x1024 is recommended. Smaller resolutions require frequent scrolling to review an entire data screen. If you plan to capture CRF pages or scanned source documents and want to compare them with the corresponding data screens, a display resolution of at least 1600x1200 is recommended. With this resolution, or better, it's possible to view two full pages side-by-side without scrolling, which is perfect for comparing data screens with source documents.

  • Why is iDataFax available as a downloadable internet application?

    As an internet application installed on your desktop iDataFax achieves performance and consistency benefits over browser based EDC systems. Web browser systems need to transmit screen update code for each page turn and as a result can be slow. In iDataFax page turns are almost instantaneous. Web based systems may not work consistently across different browsers, and are vulnerable to problems arising from browser updates. As a dedicated app, iDataFax can be deployed and controlled for the life of each research project.

Study Setup

  • How are data entry screens created?

    You start by creating CRFs, as you would for a paper based study, save them in either PDF or Postscript format, and then import a blank copy using the DF Setup tool. Data fields are then defined over those parts of the CRF used for written data entry.

  • What are the CRF requirements for intelligent character recognition (ICR)?

    DataFax ICR software reads handwritten numbers, dates, check boxes and visual analog scales.
    Numbers can be entered into a single rectangular box or each digit can be entered into a separate box .2 to .3 inches wide by .2 to .35 inches high.
    Check boxes should be .1 to .3 inches square, and visual analog scales can be represented by a horizontal line of any length.

Self Hosting

  • If we want to setup our own fax modem pool, what fax modems are compatible with DataFax?

    We recommend the Multitech line of modems, in particular the MT5634ZBA-V92, MultiModemZBA V.92, MT5656ZDX, MT5600ZDX, MT3334ZDX, MT2834ZDXb, MT2834BA, and MT1932ZDX (some of these modems are out of production but are still readily available). Other modem brands and manufacturers should also work provided they are Class 2 compatible, capable of 14,400 baud transmission speeds, and understand the Hayes or Rockwell command set.

  • How much disk space will I require on the server?

    The DataFax server software itself is approximately 300 MB with all of the documentation installed. In a networked environment, the DataFax software is installed on one of the server machines, and then accessed by other machines via file sharing. Most of the disk space required for a DataFax study is for on-line storage of CRF pages received by fax or PDF transmission.

    As a rough estimate, plan on 1GB of disk storage per 10,000 CRF pages. To calculate the total number of CRF pages for a study multiply the number of patients by the number of pages per patient by the refax rate. CRFs corrections may result in 15-30% of forms being refaxed. All CRF images are retained by DataFax unless deleted by users with permission to delete them.

    Disk storage is also required for the study data but experience has shown that this is only about 10% of the storage required for CRF pages. Optimal performance is achieved by storing study data on a disk that is local to the study server.

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