Table 1. Association rules for medical histories before the onset of depression.

Rule	Medical history 1	Medical history 2	Support %)	Confidence (%)	Lift
1	Other anxiety disorders	Sleeping disorder	9.3	50.1	1.1
2	Lipoprotein metabolic disorders and other lipemia	Sleeping disorder	8.2	51.8	1.2
3	Other causes of gastroenteritis and colitis, infections and unknown causes	Gastritis and duodenal inflammation	8.2	50.5	1.5
4	Other neurotic disorders	Sleeping disorder	8.2	50.1	1.1
5	Other intestinal dysfunction	Sleeping disorder	7.3	56.8	1.3
6	Gastroesophageal reflux disease	Gastritis and duodenal inflammation	7.2	58.2	1.8
7	Back pain	Gastritis and duodenal inflammation	7.2	50.1	1.5
8	Conjunctivitis	Vasomotor rhinitis and allergic rhinitis	6.1	52.0	2.4
9	Conjunctivitis	Refraction and accommodation disturbance	6.0	50.3	3.0
10	Essential (primary) hypertension (disease)	Sleeping disorder	5.7	56.1	1.3