Table 1.

Seroprevalence to Rickettsia conorii in the human population according to several factors

	No. of subjects	Seropositivity
		No.	%	P
Age (years)
<40	176	3	1·7	<0·003
40–70	162	10	6·8
>70	45	6	13·3
Sex
Male	181	13	7·2	0·058
Female	202	6	3·0
Residential area*
Urban	312	15	4·8	0·763
Rural or semi-rural	71	4	5·6
Other factors
Risky occupation†	13	1	7·6	0·489
No risky occupation	370	18	4·9
Contact with dogs	152	8	5·2	0·825
No contact with dogs	231	11	4·8
Outdoor activities	111	6	5·4	0·797
No outdoor activities	272	13	4·8
Practice of horticulture	25	3	12·0	0·118
No practice of  horticulture	358	16	4·5

^*Defined by number of inhabitants of municipalities: rural <5000, semi-rural 5000–50000, urban >50000.

^†Veterinarian, breeder or farmer.