Description of Test: This test consists of tasks representative of problem solving skills, fine motor coordination, and expressive and receptive vocabulary. (Bayley, N., (1976). Manual for the Bayley Scales of Infant Development. New York: Psychological Corporation.) To see the description of how the Bayley Mental Development Scale 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:
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| First page of form |
Second page of form |
Variable Names: Variables from this test have the prefix V1BAY. The data set has 790 test subjects and 100 variables. Data were collected as part of a home visit of 14 month old twins. The variables include: Interviewer ID Number, Test Date, Birth Date, Age (split into years, month, days), Raw Score, Mental Development Index, Age Equivalent, and Bayley Items 74-163. The last variable is a comments field. Move there to move to the complete list of variable names from this database.
Cleaning: The data have been examined for discrepancies between the stated age and a calculated age (test date - birth date). The data have also been examined to ensure that the values of the variables are within range.
Composites: There are no computed composites in this data set. The Bayley Raw Score is converted into a Mental Development Index score and an Age Equivalent based on information in the Manual.
| Index of variable names and their labels | |
| Variable | Label |
| TWINID | Twin ID |
| V1BAYIVR | 14M Bay: Interviewer |
| V1BAYTDT | 14M Bay: Test Date |
| V1BAYBDT | 14M Bay: Birth Date |
| V1BAYAYR | 14M Bay: Age- Years |
| V1BAYAMO | 14M Bay: Age- Months |
| V1BAYADA | 14M Bay: Age- Days |
| V1BAYRAW | 14M Bay: Raw Score |
| V1BAYMDI | 14M Bay: Mental Development Index |
| V1BAYAEQ | 14M Bay: Age Equivalent in months |
| V1BAY74 | 14M Bay: Item 74-Attends to scribbling |
| V1BAY75 | 14M Bay: Item 75-Looks for fallen spoon |
| V1BAY76 | 14M Bay: Item 76-Playful response to mirror |
| V1BAY77 | 14M Bay: Item 77-Retains 2 of 3 cubes offered |
| V1BAY78 | 14M Bay: Item 78-Manipulates bell: interest in detail |
| V1BAY79 | 14M Bay: Item 79-Vocalizes 4 different syllables |
| V1BAY80 | 14M Bay: Item 80-Pulls string adaptively: secures ring |
| V1BAY81 | 14M Bay: Item 81-Cooperates in games |
| V1BAY82 | 14M Bay: Item 82-Attempts to secure 3 cubes |
| V1BAY83 | 14M Bay: Item 83-Rings bell purposively |
| V1BAY84 | 14M Bay: Item 84-Listens selectively to familiar words |
| V1BAY85 | 14M Bay: Item 85-Says 'da-da' or equivalent |
| V1BAY86 | 14M Bay: Item 86-Uncovers toy |
| V1BAY87 | 14M Bay: Item 87-Fingers holes in peg board |
| V1BAY88 | 14M Bay: Item 88-Picks up cup: secures cube |
| V1BAY89 | 14M Bay: Item 89-Responds to verbal request |
| V1BAY90 | 14M Bay: Item 90-Puts cube in cup on command |
| V1BAY91 | 14M Bay: Item 91-Looks for contents of box |
| V1BAY92 | 14M Bay: Item 92-Stirs with spoon in imitation |
| V1BAY93 | 14M Bay: Item 93-Looks at pictures in book |
| V1BAY94 | 14M Bay: Item 94-Inhibits on comand |
| V1BAY95 | 14M Bay: Item 95-Attempts to imitate scribble |
| V1BAY96 | 14M Bay: Item 96-Unwraps cube |
| V1BAY97 | 14M Bay: Item 97-Repeats performance laughed at |
| V1BAY98 | 14M Bay: Item 98-Holds crayon adaptively |
| V1BAY99 | 14M Bay: Item 99-Pushes car along |
| V1BAY100 | 14M Bay: Item 100-Puts 3 or more cubes in cup |
| V1BAY101 | 14M Bay: Item 101-Jabbers expressively |
| V1BAY102 | 14M Bay: Item 102-Uncovers blue box |
| V1BAY103 | 14M Bay: Item 103-Turns pages of book |
| V1BAY104 | 14M Bay: Item 104-Pats whistle doll, in imitation |
| V1BAY105 | 14M Bay: Item 105-Dangles ring by string |
| V1BAY106 | 14M Bay: Item 106-Imitates words |
| V1BAY107 | 14M Bay: Item 107-Puts books in box (6 of 8) |
| V1BAY108 | 14M Bay: Item 108-Places 1 peg repeatedly |
| V1BAY109 | 14M Bay: Item 109-Removes pellet from bottle |
| V1BAY110 | 14M Bay: Item 110-Blue board: places 1 round block |
| V1BAY111 | 14M Bay: Item 111-Builds tower of 2 cubes |
| V1BAY112 | 14M Bay: Item 112-Spontaneous scribble |
| V1BAY113 | 14M Bay: Item 113-Says 2 words |
| V1BAY114 | 14M Bay: Item 114-Puts 9 cubes in cup |
| V1BAY115 | 14M Bay: Item 115-Closes round box |
| V1BAY116 | 14M Bay: Item 116-Uses gestures to make wants known |
| V1BAY117 | 14M Bay: Item 117-Shows shoes or other clothing or own toy |
| V1BAY118 | 14M Bay: Item 118-Pegs placed in 70 seconds |
| V1BAY119 | 14M Bay: Item 119-Builds tower of 3 cubes |
| V1BAY120 | 14M Bay: Item 120-Pink board: places round block |
| V1BAY121 | 14M Bay: Item 121-Buue board: places 2 round blocks |
| V1BAY122 | 14M Bay: Item 122-Attains toy with stick |
| V1BAY123 | 14M Bay: Item 123-Pegs placed in 42 seconds |
| V1BAY124 | 14M Bay: Item 124-Names 1 object |
| V1BAY125 | 14M Bay: Item 125-Imitates crayon stroke |
| V1BAY126 | 14M Bay: Item 126-Follows directions, doll |
| V1BAY127 | 14M Bay: Item 127-Uses words to make wants known |
| V1BAY128 | 14M Bay: Item 128-Points to parts of doll |
| V1BAY129 | 14M Bay: Item 129-Blue board: places 2 round and 2 square blocks |
| V1BAY130 | 14M Bay: Item 130-Names 1 picture |
| V1BAY131 | 14M Bay: Item 131-Finds 2 objects |
| V1BAY132 | 14M Bay: Item 132-Points to 3 pictures |
| V1BAY133 | 14M Bay: Item 133-Broken doll: mends marginally |
| V1BAY134 | 14M Bay: Item 134-Pegs placed in 30 seconds |
| V1BAY135 | 14M Bay: Item 135-Differentiates scribble from stroke |
| V1BAY136 | 14M Bay: Item 136-Sentence of 2 words |
| V1BAY137 | 14M Bay: Item 137-Pink board: complete |
| V1BAY138 | 14M Bay: Item 138-Names 2 objects |
| V1BAY139 | 14M Bay: Item 139-Points to 5 pictures |
| V1BAY140 | 14M Bay: Item 140-Broken doll: mends approximately |
| V1BAY141 | 14M Bay: Item 141-Names 3 pictures |
| V1BAY142 | 14M Bay: Item 142-Blue board: places 6 blocks |
| V1BAY143 | 14M Bay: Item 143-Builds tower of 6 cubes |
| V1BAY144 | 14M Bay: Item 144-Discriminates 2: cup, plate, box |
| V1BAY145 | 14M Bay: Item 145-Names watch, 4th picture |
| V1BAY146 | 14M Bay: Item 146-Names 3 objects |
| V1BAY147 | 14M Bay: Item 147-Imitates strokes: vertical and horizontal |
| V1BAY148 | 14M Bay: Item 148-Points to 7 pictures |
| V1BAY149 | 14M Bay: Item 149-Names 5 pictures |
| V1BAY150 | 14M Bay: Item 150-Names watch, 2nd picture |
| V1BAY151 | 14M Bay: Item 151-Pink board: reversed |
| V1BAY152 | 14M Bay: Item 152-Discriminates 3: cup, plate, box |
| V1BAY153 | 14M Bay: Item 153-Boken doll: mends exactly |
| V1BAY154 | 14M Bay: Item 154-Train of cubes |
| V1BAY155 | 14M Bay: Item 155-Blue board: completes in 150 seconds |
| V1BAY156 | 14M Bay: Item 156-Pegs placed in 22 seconds |
| V1BAY157 | 14M Bay: Item 157-Folds paper |
| V1BAY158 | 14M Bay: Item 158-Understands 2 prepositions |
| V1BAY159 | 14M Bay: Item 159-Blue board: completes in 90 seconds |
| V1BAY160 | 14M Bay: Item 160-Blue board: completes in 60 seconds |
| V1BAY161 | 14M Bay: Item 161-Builods tower of cubes |
| V1BAY162 | 14M Bay: Item 162-Concept of one |
| V1BAY163 | 14M Bay: Item 163-Undrstands 3 prepositions |
| V1BAYCOM | 14M Bay: Comments |
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.
