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ALSPAC Data. Measures of Childhood Incontinence. Or, if you’re squeamish…. How many kittens do you own?. Repeated questions:. Repeated questions: - Binary. Zero. One. Repeated questions: - Ordinal. Zero. One. Two ~ DSM4 criterion. Repeated questions. Asked at: 4½ years ~ KK

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alspac data

ALSPAC Data

Measures of Childhood Incontinence

repeated questions ordinal
Repeated questions: - Ordinal

Zero

One

Two ~ DSM4 criterion

repeated questions1
Repeated questions
  • Asked at:
  • 4½ years ~ KK
  • 5½ years ~ KM
  • 6½ years ~ KP
  • 7½ years ~ KR
  • 9½ years ~ KU
why mixture models
Why mixture models?
  • Previous work (clinical/epidemiological) has provided evidence for subgroups
    • Different aetilogies
    • Different comorbid factors
    • Different long-term outcomes
  • Variability in development poorly captured by standard growth models
    • Relapsing group
planned models
Planned models
  • LLCA replication of Croudace AJE model
    • Incorporate covariates into above
  • LLCA/LCGA models of frequent wetters (binary)
    • Assessment of gender invariance with knownclass
  • Parallel modelling of day/night wetting
  • Ordinal modelling of 3-level measures
    • Incorporate covariates
    • Risk of later binary outcome
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