Summary of primary outcome and exposure variables in the present study by objective and statistical tests
| Hypothesis | Outcome variable | Exposure variable | Statistics |
|---|---|---|---|
| H2(A) | OPD overall (yes on SOMA, DDS, PSAS or clinical pharyngeal signs) Dichotomous | GMFCS | Prevalence, χ2 |
| GMFM-88 domains | Binomial logistic regression | ||
| MACs | |||
| Motor type/distribution | |||
| H2(a) | SOMA (overall) Dichotomous | GMFCS | Prevalence, χ2 |
| DDS (overall) Dichotomous | GMFM-88 domains | Binomial logistic regression | |
| PSAS (overall) Dichotomous | MACs | ||
| Pharyngeal signs (overall) Dichotomous | Motor type/distribution | ||
| Saliva control (overall) Dichotomous | |||
| H2(A) | DDS Part 2 raw score Continuous | GMFM-66 | Linear regression |
| Dysphagia Severity Score Ordinal | GMFCS | Multinomial logistic regression | |
| H2(B) | Growth (height/length, knee and upper arm length) Ax1 Continuous | OPD and subtypes Ax1 | Linear regression |
| H2(B) | Nutritional Status (skin-folds, BMI) Ax1 Continuous | OPD and subtypes Ax1 | Linear regression |
| H3 | OPD, SOMA, DDS, Pharyngeal Signs, Saliva Control, Parent Report Ax2 Dichotomous | OPD, SOMA, DDS, PSAS, Pharyngeal Signs, Saliva Control, Parent Report Ax1 Dichotomous | χ2 to compare prevalence |
| Binomial logistic regression | |||
| H3 | OPD at Ax1 Dichotomous | GMFCS (collapsed) | Binomial logistic regression |
| H3 | OPD at Ax2 Dichotomous | GMFCS (collapsed) | Binomial logistic regression |
| H3 | Nutritional Interventions (tube feeding and/ or supplements) Ax2 Ordinal | OPD and subtypes Ax1 | Multinomial logistic regression |
| H3 | Growth (height/length, knee and upper arm length) Ax2 Continuous | OPD and subtypes Ax1 | Linear regression |
| H3 | Nutritional Status (skin-folds, BMI) Ax2 Continuous | OPD and subtypes Ax1 | Linear regression |
Ax1, 18–24 months assessment; Ax2, 30–36 months assessment; BMI, body mass index; DDS, Dysphagia Disorders Survey; GMFCS, Gross Motor Function Classification System; GMFM, Gross Motor Function Measure; MACs, Manual Ability Classification System; OPD, oropharyngeal dysphagia; PSAS, Pre-Speech Assessment Scale; SOMA, Schedule for Oral Motor Assessment.