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. Author manuscript; available in PMC: 2015 Jan 5.
Published in final edited form as: Am J Intellect Dev Disabil. 2013 Nov;118(6):447–459. doi: 10.1352/1944-7558-118.6.447

Table 3.

Fixed Effects of Repeated Measure Analysis of Covariance for Heart Activity Analyses

Effect df Error Interbeat interval Respiratory sinus arrhythmia
F P F p
Genetic 1 36 2.24 .14 8.62 < .001
Phase 3 104 7.03 < .001 3.50 .02
Genetic × Phase 3 104 0.67 .57 0.23 .87
Chronological age 1 36 4.46 .04 12.50 .001
Mental age 1 36 0.01 .90 1.02 .32

Note. Significant values are listed in bold.