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Table 3 Estimated fixed and random effects for quantitative observation outcomes from baseline to 6-month trial endpoint

From: Primary Care Triple P for parents of NICU graduates with behavioral problems: a randomized, clinical trial using observations of parent–child interaction

  Fixed effects Random effects
Outcome n Intervention P Time P Intervention × Time P Intercept P
Showing affectiona 66 0.05 (0.14) .716 −0.004 (0.02) .843 0.001 (0.03) .972 0.07 (93.45) .999
Non-descriptive praiseb 66 −0.71 (0.70) .313 −0.07 (0.10) .464 0.19 (0.14) .165 1.17 (0.71) .097
Descriptive praiseb 66 −0.16 (0.29) .568 −0.004 (0.04) .915 0.05 (0.05) .368 0.34 (0.13) .008
Incidental teachingc 66 0.09 (0.24) .701 −0.02 (0.04) .523 0.01 (0.05) .857 0.27 (291.82) .999
Ask, say, dod 66 0.48 (0.22) .036 0.02 (0.03) .398 −0.10 (0.04) .020 0.08 (0.05) .103
Directed discussiond 66 0.17 (0.25) .497 −0.003 (0.03) .934 −0.01 (0.04) .808 0.10 (0.04) .012
Planned ignoringd 66 0.13 (0.13) .308 −0.02 (0.02) .369 −0.02 (0.02) .513 0.003 (0.01) .834
Clear, calm instructionsb 66 0.41 (0.31) .193 −0.02 (0.05) .602 −0.01 (0.06) .816 0.17 (0.14) .219
  1. Note. Because the random effect has only one level, the covariance structure is scaled identity.
  2. aRepeated measures covariance structure is toeplitz.
  3. bRepeated measures covariance structure is scaled identity.
  4. cRepeated measures covariance structure is compound symmetry correlation metric.
  5. dRepeated measures covariance structure is diagonal.
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