A dataset with developmental scores at the item level for 2038 children measured at 16722 visits (rows) between ages 0-2.5 year.



A data.frame with 16722 rows and 64 variables:

ctrcdchrCountry code (ISO 3166-1 alpha-3)
cohortchrCohort name
cohortnchrCohort number
subjidintChild number
agedaysintAge (days)
sexchrEither "male" or "female"
gagebrthintGestational age (days)
ddicmm0290/1Reacts when spoken to
ddicmm0300/1Smiles in response (M; can ask parents)
ddicmm0310/1vocalizes in response
ddicmm0330/1Says dada, baba, gaga
ddicmm0340/1Babbles while playing
ddicmm0360/1Waves 'bye-bye' (M; can ask parents)
ddicmm0370/1Uses two words with comprehension
ddicmm0390/1Says three 'words'
ddicmm0410/1Says sentences with 2 words
ddicmm0430/1Refers to self using 'me' or 'I' (M; can ask parents)
ddicmd0440/1Points at 5 pictures in the book
ddicmd1160/1Turn head to sound
ddicmd1360/1Reacts to verbal request (M; can ask parents)
ddicmd1410/1Identifies two named objects
ddicmd1480/1Understands 'play' orders
ddifmd0010/1Eyes fixate
ddifmd0020/1Follows with eyes and head 30d < 0 > 30d
ddifmd0030/1Hands open occasionally
ddifmm0040/1Watches own hands
ddifmd0050/1Plays with hands in midline
ddifmd0070/1Passes cube from hand to hand
ddifmd0080/1Holds cube, grasps another one with other hand
ddifmm0090/1Plays with both feet
ddifmd0100/1Picks up pellet between thumb and index finger
ddifmd0110/1Puts cube in and out of a box
ddifmm0120/1Plays 'give and take' (M; can ask parents)
ddifmd0130/1Tower of 2 cubes
ddifmm0140/1Explores environment energetically (M; can ask parents)
ddifmd0150/1Builds tower of 3 cubes
ddifmm0160/1Imitates everyday activities (M; can ask parents)
ddifmd0170/1Tower of 6 cubes
ddifmd0180/1Places round block in board
ddifmm0190/1Takes off shoes and socks (M; can ask parents)
ddifmd1540/1Eats with spoon without help (M; can ask parents)
ddigmd0060/1Grasps object within reach
ddigmd0520/1Moves arms equally well
ddigmd0530/1Moves legs equally well
ddigmd0540/1Stays suspended when lifted under the armpits
ddigmd0550/1No head lag if pulled to sitting
ddigmd0560/1Lifts chin off table for a moment
ddigmd0570/1Lifts head to 45 degrees on prone position
ddigmd0580/1Looks around to side with angle face-table 90
ddigmd0590/1Flexes or stomps legs while being swung
ddigmm0600/1Rolls over back to front
ddigmd0610/1Balances head well while sitting
ddigmd0620/1Sits on buttocks while legs stretched
ddigmd0630/1Sits in stable position without support
ddigmm0640/1Crawls forward, abdomen on the floor
ddigmm0650/1Pulls up to standing position
ddigmm0660/1Crawls, abdomen off the floor (M; can ask parents)
ddigmm0670/1Walks while holding onto play-pen or furniture
ddigmd0680/1Walks alone
ddigmd0690/1Throws ball without falling
ddigmd0700/1Squats or bends to pick things up
ddigmd0710/1Kicks ball
ddigmd1460/1Drinks from cup (M; can ask parents)
ddigmd1680/1Walks well


The combination of subjid and agedays identifies each unique visit (row).

Instruments: Dutch Development Instrument (Van Wiechenschema, version 1983): ddi


Herngreen WP, Reerink JD, van Noord-Zaadstra BM, Verloove-Vanhorick SP, Ruys JH. The SMOCC-study: Design of a representative cohort of live-born infants in the Netherlands. European Journal of Public Health. 1992;2:117-122.


#> # A tibble: 6 × 64
#>   ctrycd cohort        cohortn subjid agedays sex   gagebrth ddicmm029 ddicmm030
#>   <chr>  <chr>           <int>  <int>   <int> <chr>    <int>     <int>     <int>
#> 1 NLD    GCDG-NLD-SMO…      53 5.30e6      30 Fema…      280         1         0
#> 2 NLD    GCDG-NLD-SMO…      53 5.30e6      58 Fema…      280        NA         1
#> 3 NLD    GCDG-NLD-SMO…      53 5.30e6      94 Fema…      280        NA        NA
#> 4 NLD    GCDG-NLD-SMO…      53 5.30e6     183 Fema…      280        NA        NA
#> 5 NLD    GCDG-NLD-SMO…      53 5.30e6     274 Fema…      280        NA        NA
#> 6 NLD    GCDG-NLD-SMO…      53 5.30e6     365 Fema…      280        NA        NA
#> # ℹ 55 more variables: ddicmm031 <int>, ddicmm033 <int>, ddicmm034 <int>,
#> #   ddicmm036 <int>, ddicmm037 <int>, ddicmm039 <int>, ddicmm041 <int>,
#> #   ddicmm043 <int>, ddicmd044 <int>, ddicmd116 <int>, ddicmd136 <int>,
#> #   ddicmd141 <int>, ddicmd148 <int>, ddifmd001 <int>, ddifmd002 <int>,
#> #   ddifmd003 <int>, ddifmm004 <int>, ddifmd005 <int>, ddifmd007 <int>,
#> #   ddifmd008 <int>, ddifmm009 <int>, ddifmd010 <int>, ddifmd011 <int>,
#> #   ddifmm012 <int>, ddifmd013 <int>, ddifmm014 <int>, ddifmd015 <int>, …