The following output is from a study described in Reisby et. al., (1977) that focused on relationship between plasma levels of a medication (imipramine) and the clinical response in 66 depressed subjects (coded by ID). The primary outcome was the continuous Hamilton depression rating scale which was recorded on each subject twice during the baseline placebo week as well as at the end of each of the treatment weeks of the study.

Source	DF	Sum of Squares	F Value	Pr>F
Week	??	5913.537	61.86	<.0001
ID	??	7332.449	5.90	<.0001
Error	304	5812.34
Total	374	19334.67

What does the value 7332.449 represent in the above table?