Five-factor solution. Note: High scores on RSA reactivity reflect an increase in RSA from baseline, an indicator of poor parasympathetic regulation. High scores on behavioral infant reactivity measure reflect higher latency to negative affect during arm restraint and indicate low behavioral reactivity. High scores on maternal report of infant reactivity indicates high temperamental reactivity. Scores between ± 0.5 indicate reactivity/regulation in the moderate range. Scores above ± 1.0 indicate high or low reactivity/regulation. Note. Cluster 1 refers to the Dysregulated/High Maternal Report Reactors, Cluster 2 refers to the Low Behavioral Reactors, Cluster 3 refers to the High Reactors, Cluster 4 refers to the Optimal Reactors, and Cluster 5 refers to the Dysregulated/Low Maternal Report Reactors.