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Table 1 Demographic and epidemiological characteristics of patients with brucellosis (total, No. = 850)

From: Epidemiological characteristics, clinical manifestations and laboratory findings in 850 patients with brucellosis in Heilongjiang Province, China

Variable No.(%)
Sex
 Male 633 (74.5)
 Female 217 (25.5)
Residence
 Urban 177 (20.8)
 Rural 673 (79.2)
Age group 3–87
 Mean age 46.0 ± 13.4
 0-17 years 19 (2.2)
 18–40 years 239 (28.1)
 41–65 years 544 (64.0)
 >65 years 48 (5.7)
Mean hospitalization time (day) 12.1 ± 2.8
The mean time from symptom onset to hospitalization 59.2 ± 99.2
Admission date (month)
 Spring (3–5) 273 (32.1)
 Summer(6–8) 303 (35.7)
 Autumn(9–11) 137 (16.1)
 Winter (12–2) 137 (16.1)
Medical history
 Exposure and farming of cattle or sheep 599 (70.5)
 Consumption history of raw meat or dairy 76 (8.9)
 Unknown 175 (20.6)
Occupation
 Farmer and herdsman 437 (51.4)
 Worker 118 (13.9)
 Vagrant 88 (10.4)
 Student 16 (1.9)
 Veterinarian 3 (0.3)
 Other 188 (22.1)
Staging
 Acute 781 (91.9)
 Chronic 69 (8.1)