Home: Sequenced Inventory of Communication Development at 14 Months

Description of Test: This test assesses the child's receptive and expressive language. (Hedrick, D. L., Prather, E. M., & Tobin, A. R. (1975). Sequenced Inventory of Communicative Development. Seattle: University of Washington Press.) To see the description of how the Sequenced Inventory of Communication Development was administered from the MALTS procedure document, move there.  To see the form on which the data was recorded, click on the appropriate image below:

Expressive portion of
	  SICD Form Receptive portion of
	  SICD Form
Expressive SICD form
Receptive SICD form


Variable Names:  Variable names from this database have the prefix V1SIC. The data set has 790 test subjects and 94 variables. Data were collected and scored by the tester during the home visit at 14 months. The variables include: Test Date, Test Date (split into separate day, month, and year variables), Interviewer ID, 41 SICD Expressive scale items, 45 SICD Receptive Scale items, 2 composite variables and a comment field. A PR suffix in the variable label indicates a parental evaluation (response) of the twin's ability on that particular item.  Move there to move to the complete list of variable names from this database.

Cleaning:  The data have been examined to ensure that the values of the variables are within range. Compatibility of the problem codes with the actual databases of each test will be examined. If the twin passed the exam' variable, he should have passed the parental response' variable. Compatibility of these variables will be checked.

Composites:  The variables V1SICDE and V1SICDR are composites of other variables.

V1SICDE:
   This is an adjusted sum of the Expressive Scale items. If any item was missing, it was replaced by the mean score for that item except for items SCE25A-SCE25E. Note that the earlier versions of these data did not replace SCE6A (V1SIC1). As of this version of the data, the only excluded items are SCE25A-SCE25E.

The reasons for excluding these items from the mean substitution are:

1. These are low frequency pass items.

2. They were inconsistently given to all children.

3. Children who were given these items were likely to be at the high end of ability.


If more than 5 items were missing in the data, the composite score was entered as missing.

V1SICDR:
   This is an adjusted sum of the Receptive Scale items. If any item was missing, it was replaced by the mean score for that item except for items SCR17A-SCR17D, SCR18. The reasons for excluding these items from the means substitution are the same as noted above for the Expressive Scale items. If more than 6 items were missing in the data, the composite score was entered as missing.

Complete List of Variable Names: 
Index of variable names and their labels
Variable Label
TWINID Twin ID
V1SICTDY 14M SICD:  Test date year
V1SICTDM 14M SICD:  Test date month
V1SICTDD 14M SICD:  Test date day
V1SICTDT 14M SICD:  Test date
V1SICIVR 14M SICD:  Interviewer
V1SIC1 14M SICD-Exp:  SCE9aPR-Uses vowels-Parental report
V1SIC2 14M SICD-Exp:  SCE9bPR-Uses consonant-vowel combination-Parental report
V1SIC3 14M SICD-Exp:  SCE9cPR-Uses consonants alone-Parental report
V1SIC4 14M SICD-Exp:  SCE9dPR-Uses combinations that sounds like words-Parental report
V1SIC5 14M SICD-Exp:  SCE10PR-Intonational patterns-Parental report
V1SIC6 14M SICD-Exp:  SCE11PR-Imitates sounds-Parental report
V1SIC7 14M SICD-Exp:  SCE12PR-Uses question inflection-Parental report
V1SIC8 14M SICD-Exp:  SCE13PR-Uses sentence-like intonational patterns-Parental report
V1SIC9 14M SICD-Exp:  SCE14dPR-Imitates hand clap-Parental report
V1SIC10 14M SICD-Exp:  SCE14ePR-Imitates peek-a-boo-Parental report
V1SIC11 14M SICD-Exp:  SCE14aPR-Imitates blocks in box-Parental report
V1SIC12 14M SICD-Exp:  SCE14a-Imitates blocks in box
V1SIC13 14M SICD-Exp:  SCE14bPR-Imitates block stacking-Parental report
V1SIC14 14M SICD-Exp:  SCE14b-Imitates block stacking
V1SIC15 14M SICD-Exp:  SCE14cPR-Imitates roll ball-Parental report
V1SIC16 14M SICD-Exp:  SCE14c-Imitates roll ball
V1SIC17 14M SICD-Exp:  SCE14d-Imitates hand clap
V1SIC18 14M SICD-Exp:  SCE14e-Imitates peek-a-boo
V1SIC19 14M SICD-Exp:  SCE15aPR-Imitates tongue click-Parental report
V1SIC20 14M SICD-Exp:  SCE15bPR-Imitates cough-Parental report
V1SIC21 14M SICD-Exp:  SCE15cPR-Imitates motor sound-Parental report
V1SIC22 14M SICD-Exp:  SCE15a-Imitates tongue click
V1SIC23 14M SICD-Exp:  SCE15b-Imitates cough
V1SIC24 14M SICD-Exp:  SCE15c-Imitates motor sound
V1SIC25 14M SICD-Exp:  SCE16PR-Uses consistent sound combinations as words-Parental report
V1SIC26 14M SICD-Exp:  SCE17PR-Responds to "Hi"-Parental report
V1SIC27 14M SICD-Exp:  SCE18PR-Imitates intonational patterns-Parental report
V1SIC28 14M SICD-Exp:  SCE19PR-Gestures to "ask names of things"-Parental report
V1SIC29 14M SICD-Exp:  SCE20PR-Uses "No" or "No-No"-Parental report
V1SIC30 14M SICD-Exp:  SCE22a-Names picture "baby"
V1SIC31 14M SICD-Exp:  SCE22b-Names picture "shoe"
V1SIC32 14M SICD-Exp:  SCE22c-Names picture "ball"
V1SIC33 14M SICD-Exp:  SCE23-Imitates 2 of 5 words on request
V1SIC34 14M SICD-Exp:  SCE24-Imitates words spontaneously
V1SIC35 14M SICD-Exp:  SCE25a-Imitates /ai/
V1SIC36 14M SICD-Exp:  SCE25b-Imitates /m/
V1SIC37 14M SICD-Exp:  SCE25c-Imitates /n/
V1SIC38 14M SICD-Exp:  SCE25d-Imitates /q/
V1SIC39 14M SICD-Exp:  SCE25e-Imitates /p/
V1SIC40 14M SICD-Exp:  SCE26a-Imitates "mama"
V1SIC41 14M SICD-Exp:  SCE26b-Imitates "papa"
V1SIC42 14M SICD-Rec:  SCR6aPR-Responds to "Come up" with gesture-Parental report
V1SIC43 14M SICD-Rec:  SCR6b-Responds to "Come up" with gesture
V1SIC44 14M SICD-Rec:  SCR7PR-Differential responses to environmental sounds-Parental report
V1SIC45 14M SICD-Rec:  SCR8aPR-Responds to words at home-toys-Parental report
V1SIC46 14M SICD-Rec:  SCR8bPR-Responds to words at home-names of family members-Parental report
V1SIC47 14M SICD-Rec:  SCR8cPR-Responds to words at home-items of clothing-Parental report
V1SIC48 14M SICD-Rec:  SCR8dPR-Responds to words at home-verbs-Parental report
V1SIC49 14M SICD-Rec:  SCR8ePR-Responds to words at home-names of acquaintances-Parental report
V1SIC50 14M SICD-Rec:  SCR8fPR-Responds to words at home-names of outdoor items-Parental report
V1SIC51 14M SICD-Rec:  SCR8gPR-Responds to words at home-descriptive words-Parental report
V1SIC52 14M SICD-Rec:  SCR8hPR-Responds to words at home-household tools-Parental report
V1SIC53 14M SICD-Rec:  SCR8iPR-Responds to words at home-pronouns-Parental report
V1SIC54 14M SICD-Rec:  SCR8jPR-Responds to words at home-names of buildings-Parental report
V1SIC55 14M SICD-Rec:  SCR8kPR-Responds to words at home-names of games-Parental report
V1SIC56 14M SICD-Rec:  SCR9-Responds to "intonation"
V1SIC57 14M SICD-Rec:  SCR10-Responds to"give me," plus gestures
V1SIC58 14M SICD-Rec:  SCR11a-Responds to specific word
V1SIC59 14M SICD-Rec:  SCR11bPR-Responds to specific word-Parental report
V1SIC60 14M SICD-Rec:  SCR12a-Responds to commands, plus situation-"Get the car"
V1SIC61 14M SICD-Rec:  SCR12b-Responds to commands, plus situation-"Give it to me"
V1SIC62 14M SICD-Rec:  SCR12c-Responds to commands, plus situation-"Put it on the paper"
V1SIC63 14M SICD-Rec:  SCR13a-Points to ears
V1SIC64 14M SICD-Rec:  SCR13b-Points to eyes
V1SIC65 14M SICD-Rec:  SCR13c-Points to hair
V1SIC66 14M SICD-Rec:  SCR13d-Points to mouth
V1SIC67 14M SICD-Rec:  SCR13e-Points to nose
V1SIC68 14M SICD-Rec:  SCR13aPR-Points to ears-Parental report
V1SIC69 14M SICD-Rec:  SCR13bPR-Points to eyes-Parental report
V1SIC70 14M SICD-Rec:  SCR13cPR-Points to hair-Parental report
V1SIC71 14M SICD-Rec:  SCR13dPR-Points to mouth-Parental report
V1SIC72 14M SICD-Rec:  SCR13ePR-Points to nose-Parental report
V1SIC73 14M SICD-Rec:  SCR14a-Responds to sit down/stand up
V1SIC74 14M SICD-Rec:  SCR14bPR-Responds to sit down/stand up-Parental report
V1SIC75 14M SICD-Rec:  SCR15a-Speech discrimination-socks
V1SIC76 14M SICD-Rec:  SCR15b-Speech discrimination-tree
V1SIC77 14M SICD-Rec:  SCR15c-Speech discrimination-bear
V1SIC78 14M SICD-Rec:  SCR15d-Speech discrimination-chair
V1SIC79 14M SICD-Rec:  SCR15e-Speech discrimination-key
V1SIC80 14M SICD-Rec:  SCR15f-Speech discrimination-box
V1SIC81 14M SICD-Rec:  SCR16-Responds to the name of a fimiliar person
V1SIC82 14M SICD-Rec:  SCR17a-Responds to prepositional commands-on
V1SIC83 14M SICD-Rec:  SCR17b-Responds to prepositional commands-in
V1SIC84 14M SICD-Rec:  SCR17c-Responds to prepositional commands-beside
V1SIC85 14M SICD-Rec:  SCR17d-Responds to prepositional commands-under
V1SIC86 14M SICD-Rec:  SCR18-Responds to "Bye-bye" without gesture
V1SICDE 14M SICD-Exp:  Total Expressive scales corrected for missing data
V1SICDR 14M SICD-Rec:  Total Receptive scales corrected for missing data
V1SICCOM 14M SICD: Comments
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Procedure Description:

Bayley Scales of Infant Development (Mental Development Scales) and Sequenced Inventory of Communication Development

These two assessments were integrated into one procedure at 14, 20, and 24 months, a more natural and more efficient presentation for children of these ages. The Bayley consists of many tasks representative of problem solving, fine motor coordination, and expressive and receptive vocabulary. Mothers were told that the children’s best performance may depend on either her close proximity or, conversely, her absence during this assessment. Examiners proceeded with each child until a baseline and ceiling of the child’s abilities was obtained. Children who became distressed were permitted to complete testing while sitting on their mother’s lap. The Bayley Scales assessed each child’s level of general cognitive development as compared with other children of the same age.

The Sequenced Inventory of Communication Development was used to assess each child’s receptive and productive language. This included a separate Parental Report Interview in which, at a later point in the visit, mother’s were asked questions pertaining to each child’s expressive and receptive communication.

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