Table 1. Characteristics of case- and control-persons in the study of risk factors for influenza A (H7N9) virus human infections — Zhejiang Province, China, 2013.

Characteristics	case(n = 43)	%	control(n = 215)	%	P
Age (years), median (range)	63(31–86)		61(28–84)		0.98
28–29	0	0	2	1
30–59	20	47	95	44
60–86	23	53	118	55
Sex					1.0
Men	27	63	135	63
Women	16	37	80	37
Place of residence					1.0
Urban area	25	58	125	58
Rural area	18	42	90	42
Education level					0.98
Primary school or below	17	40	78	36
Junior middle school	16	37	80	37
Senior middle school	7	16	37	17
College or higher	3	7.0	20	9
Occupation					0.75
Self-employed	6	14	31	14
Full-time employees	8	19	42	20
Home-maker	0	0	7	3.0
Farmer	12	28	67	31
Retiree	14	33	61	28
Unemployed	3	7.0	7	3.0