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© 2022 Clinical Data Interchange Standards Consortium, Inc. All rights reserved. 

1 Introduction

This document describes the CDISC implementation of the 4-Stair Descend (4-STAIR DESCEND) instrument.

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The CDISC Intellectual Property Policy can be found on the CDISC website at: https://www.cdisc.org/about/bylaws.

1.1 Representations and Warranties, Limitations of Liability, and Disclaimers

This document is a supplement to the SDTMIG for Human Clinical Trials and is covered under Appendix F of that document, which describes representations, warranties, limitations of liability, and disclaimers. Please see Appendix F of the SDTMIG for a complete version of this material.

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Although the United States Food and Drug Administration (US FDA) has provided input with regard to this supplement, this input does not constitute US FDA endorsement of any particular instrument.

2 Copyright Status

CDISC believes this instrument to be in the public domain, but you should perform your own assessment. CDISC has included the 4-STAIR DESCEND in the library of QRS data standards supplements. Hence, CDISC developed FTTESTCD and FTTEST for each item based on the actual text on the instrument

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. There may be many versions of this instrument in the public domain or copyrighted. CDISC has chosen to use this version as the data standard.

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McDonald CM, Henricson EK, Abresch RT, et al. The 6-minute walk test

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and other clinical endpoints in duchenne muscular dystrophy: reliability, concurrent validity, and minimal clinically important differences from a multicenter study. Muscle Nerve. 2013;48(3):357-68

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.

3 The FT Domain Model

3.1 Assumptions for FT Domain Model

All assumptions and business rules described in the SDTMIG FT domain are applicable to this supplement. Additional assumptions specific to the 4-STAIR DESCEND are listed below.

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1. The numerical value for the time to complete the 4-STAIR DESCEND is recorded using ISO 8601 format in FTORRES and FTSTRESC. Because ISO 8601 format is a text format, there are no standard numeric scores or units. The sponsor enters the time on the CRF in minutes and seconds according to their protocol. (e.g., 1 minute 10 seconds is represented in the FT domain in ISO 8601 format as "T1M10S")

2. For the test grade (where FTTESTCD = "D4STR104"), FTORRES is populated with the text description. The numeric rating is represented in FTSTRESC and FTSTRESN.

3. If the entire instrument was not done, the first question on the CRF represents the reason the entire instrument was not done. If the reason not done is provided, then FTSTAT = "NOT DONE" and FTREASND is equal to the text written on the form for all the test codes. 

   1. If the test was not done due to disease, the record where FTTESTCD = "D4STR101" will have FTORRES and FTSTRESC equal to "No, Due to disease under study" and the test grade (FTTESTCD = "D4STR104") will be represented with a value of 1 = "Unable to walk independently"

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      .

4. Some items on the 4-STAIR DESCEND may be logically skipped per the instrument instructions. If the test was not done because of disease, FTTESTCD = "D4STR102" and "D4STR103" are not done and are treated as logically skipped items. A record is created in ft.xpt for all items. When an item is considered a logically skipped item, it is represented as follows:

   1. FTSTAT = "NOT DONE"     

   2. FTREASND = "LOGICALLY SKIPPED ITEM

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      "
      

   3. FTORRES, FTSTRESC, and FTSTRESN are set to null

   5. Terminology:

   1. FTCAT, FTTESTCD, and FTTEST values are included in CDISC Controlled Terminology.

   2. A full list of value sets for result and units fields is provided in Section 4, SDTM Mapping Strategy.

3.2 Example for the 4-STAIR DESCEND FT Domain Model

The 4-STAIR DESCEND example below shows the terminology used to implement the instrument in the FT domain. This example shows

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the data for 1 subject collected at the baseline visit for the 4-STAIR DESCEND instrument, and data for 1 subject who did not perform the test. The example uses CDISC Controlled Terminology for FTTESTCD, FTTEST, FTORRESU, FTSTRESU,

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and FTCAT. All original results, matching the CRF item response text, are represented in FTORRES. This result is then represented as a standard numeric score in FTSTRESN and as a standard character representation in FTSTRESC.

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Dataset wrap
Name ft
Rowcaps Rows 1-4: Show a subject who refused to do the test.  All 4 questions were marked as not done with the reason written at the top of the CRF. Rows 5-8: Show a subject who was not able to do the test due to disease progression. Rows 6 and 7 are logically skipped items because the subject was not able to do the 4-stair descend. The test grade is shown on row 8. Rows 9-12: Show a subject who was able to complete the test. Dataset2 Row STUDYID DOMAIN USUBJID FTSEQ FTTESTCD FTTEST FTCAT FTORRES FTSTRESC FTSTRESN FTSTAT FTREASND FTLOBXFL VISITNUM FTDTC 1 STUDYX FT 1001-001 1 D4STR101 D4STR1-Was 4-Stair Descend Performed 4-STAIR DESCEND NOT DONE REFUSED Y 1 2015-05-15 2 STUDYX FT 1001-001 2 D4STR102 D4STR1-Time to Do 4-Stair Descend 4-STAIR DESCEND NOT DONE REFUSED Y 1 2015-05-15 3 STUDYX FT 1001-001 3 D4STR103 D4STR1-Wear Orthoses 4-STAIR DESCEND NOT DONE REFUSED Y 1 2015-05-15 4 STUDYX FT 1001-001 4 D4STR104 D4STR1-Test Grade 4-STAIR DESCEND NOT DONE REFUSED Y 1 2015-05-15 5 STUDYX FT 1001-002 1 D4STR101 D4STR1-Was 4-Stair Descend Performed 4-STAIR DESCEND No, Due to disease under study No, Due to disease under study Y 1 2015-05-15 6 STUDYX FT 1001-002 2 D4STR102 D4STR1-Time to Do 4-Stair Descend 4-STAIR DESCEND NOT DONE LOGICALLY SKIPPED ITEM Y 1 2015-05-15 7 STUDYX FT 1001-002 3 D4STR103 D4STR1-Wear Orthoses 4-STAIR DESCEND NOT DONE LOGICALLY SKIPPED ITEM Y 1 2015-05-15 8 STUDYX FT 1001-002 4 D4STR104 D4STR1-Test Grade 4-STAIR DESCEND Unable to descend 4 standard stairs. 1 1 Y 1 2015-05-15 9 STUDYX FT 1001-003 1 D4STR101 D4STR1-Was 4-Stair Descend Performed 4-STAIR DESCEND Yes Y Y 1 2015-05-15 10 STUDYX FT 1001-003 2 D4STR102 D4STR1-Time to Do 4-Stair Descend 4-STAIR DESCEND PT1M32S PT1M32S Y 1 2015-05-15 11 STUDYX FT 1001-003 3 D4STR103 D4STR1-Wear Orthoses 4-STAIR DESCEND No N Y 1 2015-05-15 12 STUDYX FT 1001-003 4 D4STR104 D4STR1-Test Grade 4-STAIR DESCEND Descends 4 standard stairs alternating feet, needs handrail for support. 5 5 Y 1 2015-05-15

4 SDTM Mapping Strategy

This section is used for reference regarding the CRF data capture and to understand the alignment of the instrument to the SDTM FT domain. It also provides guidance on how the result and unit variables (FTORRES, FTSTRESC, FTSTRESN, FTORRESU, and FTSTRESU)

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 should be populated.

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