Table 1. Correlation between information obtained from a structured interview and medical records for major depression onset and episodes.

	Medical record	Structured interview	N	r	icc
Age of onset	35.3±9.1(14∼50)	34.8±9.3(14∼50)	1693	+0.93	+0.92
Longest duration	80.5±124.7(2∼780)	47.3±84.6(2∼832)	1832	+0.65	+0.65
Number of episodes	3.7±4.3(1∼63)	4.2±5.0(1∼63)	1734	+0.70	+0.67

The table gives the mean, the standard deviation and the range for age in years of onset of major depression, the duration of the longest episode (in weeks) and the total number of episodes. The final two columns give the total number of observations (n), the Pearson correlation coefficient (r), and the intraclass correlation coefficient (icc).